diff --git a/.claude/skills/test-strategy/SKILL.md b/.claude/skills/test-strategy/SKILL.md
new file mode 100644
index 0000000..49faa6e
--- /dev/null
+++ b/.claude/skills/test-strategy/SKILL.md
@@ -0,0 +1,67 @@
+---
+name: test-strategy
+description: Place tests the house way — Vitest specs co-located by layer (pure domain, no TestBed; parse* trust boundaries; thin UI via Storybook a11y). Use whenever adding a spec or deciding what to test.
+---
+
+# Test strategy (test where it's pure)
+
+Push logic down to where it's pure, test it there directly, keep the layers above thin.
+No `TestBed` for domain. Never assert on user-facing copy.
+
+## Rules
+
+- **`domain/` + any pure logic → required spec.** Reducers, combinators, `visibleSteps`,
+  policies, parsers. Import the function and call it — no Angular, no `TestBed`.
+- **Value-object parser → happy path + normalisation + each rejection.** Assert on the
+  `Result` discriminant (`.ok`) and the parsed value, **not** the error message.
+- **`infrastructure/` `parse*` (trust boundary) → required spec.** Accept a valid DTO;
+  reject `null`, `{}`, and malformed shapes. Name it `describe('… (trust boundary)')`.
+- **`application/` stores/commands → spec** the pure reduce + optimistic
+  begin→confirm/rollback + the command `Result`.
+- **`ui/` → Storybook story, not a component test.** Axe runs on every story; add a `play`
+  only for wiring axe can't see.
+- **Never assert on `$localize` copy.** It changes per locale/edit — assert on the
+  `Result`, the value object, or the message id.
+
+## Skeleton
+
+Co-locate `*.spec.ts` next to the unit, in the same layer folder:
+
+```
+<context>/domain/<thing>.spec.ts            # pure — no TestBed
+<context>/domain/value-objects/<vo>.spec.ts # parser: ok + normalise + each reject
+<context>/infrastructure/<x>.adapter.spec.ts# parse* trust boundary
+<context>/application/<store|command>.spec.ts
+```
+
+Minimal parser spec:
+
+```ts
+import { describe, it, expect } from 'vitest';
+import { parseThing } from './thing';
+
+describe('parseThing', () => {
+  it('accepts + normalises', () => {
+    const r = parseThing(' raw ');
+    expect(r.ok).toBe(true);
+    if (r.ok) expect(r.value).toBe('RAW');
+  });
+  it('rejects malformed', () => {
+    expect(parseThing('').ok).toBe(false); // asserts the tag, not the copy
+  });
+});
+```
+
+## Worked examples
+
+- `src/app/registratie/domain/value-objects/postcode.spec.ts` — parser style.
+- `src/app/registratie/infrastructure/brp.adapter.spec.ts` — trust boundary (`null`/`{}`).
+- `src/app/registratie/domain/registratie-wizard.machine.spec.ts` — pure reducer.
+
+## Verify
+
+```bash
+npm test                     # Vitest (ng test — no vitest.config)
+npm run test-storybook       # axe over every story (UI a11y gate)
+cd backend && dotnet test    # backend rule + endpoint + golden tests
+```
diff --git a/.storybook/main.ts b/.storybook/main.ts
index 8f7dd16..12a3b69 100644
--- a/.storybook/main.ts
+++ b/.storybook/main.ts
@@ -1,8 +1,18 @@
 import type { StorybookConfig } from '@storybook/angular';
+import remarkGfm from 'remark-gfm';
 
 const config: StorybookConfig = {
   stories: ['../src/**/*.mdx', '../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
-  addons: ['@storybook/addon-a11y', '@storybook/addon-docs', '@storybook/addon-onboarding'],
+  addons: [
+    '@storybook/addon-a11y',
+    // remark-gfm so GFM pipe tables in *.mdx docs actually render (addon-docs
+    // doesn't parse them without it).
+    {
+      name: '@storybook/addon-docs',
+      options: { mdxPluginOptions: { mdxCompileOptions: { remarkPlugins: [remarkGfm] } } },
+    },
+    '@storybook/addon-onboarding',
+  ],
   framework: '@storybook/angular',
   // Serve the vendored CIBG package so preview-head.html can <link> its CSS (and its
   // relative font/icon/image url()s resolve) — mirrors index.html for the real app.
diff --git a/package-lock.json b/package-lock.json
index 84fa390..cc16133 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -41,6 +41,7 @@
         "jsdom": "^29.0.0",
         "nswag": "^14.7.1",
         "prettier": "^3.8.1",
+        "remark-gfm": "^4.0.1",
         "storybook": "^10.4.6",
         "typescript": "~6.0.2",
         "typescript-eslint": "^8.62.0",
@@ -9639,6 +9640,16 @@
         "@types/node": "*"
       }
     },
+    "node_modules/@types/debug": {
+      "version": "4.1.13",
+      "resolved": "https://registry.npmjs.org/@types/debug/-/debug-4.1.13.tgz",
+      "integrity": "sha512-KSVgmQmzMwPlmtljOomayoR89W4FynCAi3E8PPs7vmDVPe84hT+vGPKkJfThkmXs0x0jAaa9U8uW8bbfyS2fWw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/ms": "*"
+      }
+    },
     "node_modules/@types/deep-eql": {
       "version": "4.0.2",
       "resolved": "https://registry.npmjs.org/@types/deep-eql/-/deep-eql-4.0.2.tgz",
@@ -9773,6 +9784,16 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/mdast": {
+      "version": "4.0.4",
+      "resolved": "https://registry.npmjs.org/@types/mdast/-/mdast-4.0.4.tgz",
+      "integrity": "sha512-kGaNbPh1k7AFzgpud/gMdvIm5xuECykRR+JnWKQno9TAXVa6WIVCGTPvYGekIDL4uwCZQSYbUxNBSb1aUo79oA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "*"
+      }
+    },
     "node_modules/@types/mdx": {
       "version": "2.0.14",
       "resolved": "https://registry.npmjs.org/@types/mdx/-/mdx-2.0.14.tgz",
@@ -9787,6 +9808,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/ms": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/@types/ms/-/ms-2.1.0.tgz",
+      "integrity": "sha512-GsCCIZDE/p3i96vtEqx+7dBUGXrc7zeSK3wwPHIaRThS+9OhWIXRqzs4d6k1SVU8g91DrNRWxWUGhp5KXQb2VA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/node": {
       "version": "26.1.0",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-26.1.0.tgz",
@@ -9878,6 +9906,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@types/unist": {
+      "version": "3.0.3",
+      "resolved": "https://registry.npmjs.org/@types/unist/-/unist-3.0.3.tgz",
+      "integrity": "sha512-ko/gIFJRv177XgZsZcBwnqJN5x/Gien8qNOn0D5bQU/zAzVf9Zt3BlcUiLqhV9y4ARk0GbT3tnUiPNgnTXzc/Q==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/@types/wait-on": {
       "version": "5.3.4",
       "resolved": "https://registry.npmjs.org/@types/wait-on/-/wait-on-5.3.4.tgz",
@@ -11654,6 +11689,17 @@
         "@babel/core": "^7.11.0 || ^8.0.0-beta.1"
       }
     },
+    "node_modules/bail": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/bail/-/bail-2.0.2.tgz",
+      "integrity": "sha512-0xO6mYd7JB2YesxDKplafRpsiOzPt9V02ddPCLbY1xYGPOX24NTyN50qnUxgCPcSoYMhKpAuBTjQoRZCAkUDRw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/balanced-match": {
       "version": "4.0.4",
       "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-4.0.4.tgz",
@@ -12153,6 +12199,17 @@
         "node": ">=4"
       }
     },
+    "node_modules/ccount": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/ccount/-/ccount-2.0.1.tgz",
+      "integrity": "sha512-eyrF0jiFpY+3drT6383f1qhkbGsLSifNAjA61IUjZjmLCWjItY6LB9ft9YhoDgwfmclB2zhu51Lc7+95b8NRAg==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/chai": {
       "version": "5.3.3",
       "resolved": "https://registry.npmjs.org/chai/-/chai-5.3.3.tgz",
@@ -12197,6 +12254,17 @@
         "node": ">=10"
       }
     },
+    "node_modules/character-entities": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/character-entities/-/character-entities-2.0.2.tgz",
+      "integrity": "sha512-shx7oQ0Awen/BRIdkjkvz54PnEEI/EjwXDSIZp86/KKdbafHh1Df/RYGBhn4hbe2+uKC9FnT5UCEdyPz3ai9hQ==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/chardet": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/chardet/-/chardet-2.2.0.tgz",
@@ -13212,6 +13280,20 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/decode-named-character-reference": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/decode-named-character-reference/-/decode-named-character-reference-1.3.0.tgz",
+      "integrity": "sha512-GtpQYB283KrPp6nRw50q3U9/VfOutZOe103qlN7BPP6Ad27xYnOIWv4lPzo8HCAL+mMZofJ9KEy30fq6MfaK6Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "character-entities": "^2.0.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/dedent": {
       "version": "1.7.2",
       "resolved": "https://registry.npmjs.org/dedent/-/dedent-1.7.2.tgz",
@@ -13333,6 +13415,16 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/dequal": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/dequal/-/dequal-2.0.3.tgz",
+      "integrity": "sha512-0je+qPKHEMohvfRTCEo3CrPG6cAzAYgmzKyxRiYSSDkS6eGJdyVJm7WaYA5ECaAD9wLB2T4EEeymA5aFVcYXCA==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6"
+      }
+    },
     "node_modules/destroy": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/destroy/-/destroy-1.2.0.tgz",
@@ -13372,6 +13464,20 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/devlop": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/devlop/-/devlop-1.1.0.tgz",
+      "integrity": "sha512-RWmIqhcFf1lRYBvNmr7qTNuyCt/7/ns2jbpp1+PalgE/rDQcBT0fioSMUpJ93irlUhC5hrg4cYqe6U+0ImW0rA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "dequal": "^2.0.0"
+      },
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/diffable-html": {
       "version": "4.1.0",
       "resolved": "https://registry.npmjs.org/diffable-html/-/diffable-html-4.1.0.tgz",
@@ -14418,6 +14524,13 @@
         "url": "https://opencollective.com/express"
       }
     },
+    "node_modules/extend": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/extend/-/extend-3.0.2.tgz",
+      "integrity": "sha512-fjquC59cD7CyW6urNXK0FBufkZcoiGG80wTuPujX590cB5Ttln20E2UB4S/WARVqhXffZl2LNgS+gQdPIIim/g==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/fancy-log": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/fancy-log/-/fancy-log-2.0.0.tgz",
@@ -16360,6 +16473,19 @@
         "node": ">=0.12.0"
       }
     },
+    "node_modules/is-plain-obj": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/is-plain-obj/-/is-plain-obj-4.1.0.tgz",
+      "integrity": "sha512-+Pgi+vMuUNkJyExiMBt5IlFoMyKnr5zhJ4Uspz58WOhBF5QoIZkFyNHIbBAtHwzVAgk5RtndVNsDRN61/mmDqg==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
     "node_modules/is-plain-object": {
       "version": "5.0.0",
       "resolved": "https://registry.npmjs.org/is-plain-object/-/is-plain-object-5.0.0.tgz",
@@ -18482,6 +18608,17 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/longest-streak": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/longest-streak/-/longest-streak-3.1.0.tgz",
+      "integrity": "sha512-9Ri+o0JYgehTaVBBDoMqIl8GXtbWg711O3srftcHhZ0dqnETqLaoIK0x17fUw9rFSlK/0NlsKe0Ahhyl5pXE2g==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/loupe": {
       "version": "3.2.1",
       "resolved": "https://registry.npmjs.org/loupe/-/loupe-3.2.1.tgz",
@@ -18596,6 +18733,17 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/markdown-table": {
+      "version": "3.0.4",
+      "resolved": "https://registry.npmjs.org/markdown-table/-/markdown-table-3.0.4.tgz",
+      "integrity": "sha512-wiYz4+JrLyb/DqW2hkFJxP7Vd7JuTDm77fvbM8VfEQdmSMqcImWeeRbHwZjBjIFki/VaMK2BhFi7oUUZeM5bqw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/marked": {
       "version": "7.0.3",
       "resolved": "https://registry.npmjs.org/marked/-/marked-7.0.3.tgz",
@@ -18632,6 +18780,219 @@
         "node": ">= 0.4"
       }
     },
+    "node_modules/mdast-util-find-and-replace": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/mdast-util-find-and-replace/-/mdast-util-find-and-replace-3.0.2.tgz",
+      "integrity": "sha512-Tmd1Vg/m3Xz43afeNxDIhWRtFZgM2VLyaf4vSTYwudTyeuTneoL3qtWMA5jeLyz/O1vDJmmV4QuScFCA2tBPwg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "escape-string-regexp": "^5.0.0",
+        "unist-util-is": "^6.0.0",
+        "unist-util-visit-parents": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/mdast-util-find-and-replace/node_modules/escape-string-regexp": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/escape-string-regexp/-/escape-string-regexp-5.0.0.tgz",
+      "integrity": "sha512-/veY75JbMK4j1yjvuUxuVsiS/hr/4iHs9FTT6cgTexxdE0Ly/glccBAkloH/DofkjRbZU3bnoj38mOmhkZ0lHw==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=12"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/sindresorhus"
+      }
+    },
+    "node_modules/mdast-util-from-markdown": {
+      "version": "2.0.3",
+      "resolved": "https://registry.npmjs.org/mdast-util-from-markdown/-/mdast-util-from-markdown-2.0.3.tgz",
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+      "dev": true,
+      "license": "MIT",
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+        "@types/mdast": "^4.0.0",
+        "@types/unist": "^3.0.0",
+        "decode-named-character-reference": "^1.0.0",
+        "devlop": "^1.0.0",
+        "mdast-util-to-string": "^4.0.0",
+        "micromark": "^4.0.0",
+        "micromark-util-decode-numeric-character-reference": "^2.0.0",
+        "micromark-util-decode-string": "^2.0.0",
+        "micromark-util-normalize-identifier": "^2.0.0",
+        "micromark-util-symbol": "^2.0.0",
+        "micromark-util-types": "^2.0.0",
+        "unist-util-stringify-position": "^4.0.0"
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+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
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+      "resolved": "https://registry.npmjs.org/mdast-util-gfm/-/mdast-util-gfm-3.1.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "mdast-util-from-markdown": "^2.0.0",
+        "mdast-util-gfm-autolink-literal": "^2.0.0",
+        "mdast-util-gfm-footnote": "^2.0.0",
+        "mdast-util-gfm-strikethrough": "^2.0.0",
+        "mdast-util-gfm-table": "^2.0.0",
+        "mdast-util-gfm-task-list-item": "^2.0.0",
+        "mdast-util-to-markdown": "^2.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/mdast-util-gfm-autolink-literal": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/mdast-util-gfm-autolink-literal/-/mdast-util-gfm-autolink-literal-2.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "ccount": "^2.0.0",
+        "devlop": "^1.0.0",
+        "mdast-util-find-and-replace": "^3.0.0",
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+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
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+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/mdast-util-gfm-footnote/-/mdast-util-gfm-footnote-2.1.0.tgz",
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+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "devlop": "^1.1.0",
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+        "url": "https://opencollective.com/unified"
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
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+          "url": "https://opencollective.com/unified"
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+      "license": "MIT"
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+      "funding": [
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+          "type": "OpenCollective",
+          "url": "https://opencollective.com/unified"
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+      "license": "MIT"
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+      "funding": [
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+          "url": "https://opencollective.com/unified"
+        }
+      ],
+      "license": "MIT",
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+          "url": "https://opencollective.com/unified"
+        }
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+      "license": "MIT",
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+      "dev": true,
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+          "url": "https://opencollective.com/unified"
+        }
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+      "license": "MIT",
+      "dependencies": {
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+        "micromark-util-encode": "^2.0.0",
+        "micromark-util-symbol": "^2.0.0"
+      }
+    },
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+      "dev": true,
+      "funding": [
+        {
+          "type": "GitHub Sponsors",
+          "url": "https://github.com/sponsors/unifiedjs"
+        },
+        {
+          "type": "OpenCollective",
+          "url": "https://opencollective.com/unified"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "devlop": "^1.0.0",
+        "micromark-util-chunked": "^2.0.0",
+        "micromark-util-symbol": "^2.0.0",
+        "micromark-util-types": "^2.0.0"
+      }
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+    "node_modules/micromark-util-symbol": {
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+      "dev": true,
+      "funding": [
+        {
+          "type": "GitHub Sponsors",
+          "url": "https://github.com/sponsors/unifiedjs"
+        },
+        {
+          "type": "OpenCollective",
+          "url": "https://opencollective.com/unified"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/micromark-util-types": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/micromark-util-types/-/micromark-util-types-2.0.2.tgz",
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+      "dev": true,
+      "funding": [
+        {
+          "type": "GitHub Sponsors",
+          "url": "https://github.com/sponsors/unifiedjs"
+        },
+        {
+          "type": "OpenCollective",
+          "url": "https://opencollective.com/unified"
+        }
+      ],
+      "license": "MIT"
+    },
     "node_modules/micromatch": {
       "version": "4.0.8",
       "resolved": "https://registry.npmjs.org/micromatch/-/micromatch-4.0.8.tgz",
@@ -21517,6 +22469,58 @@
         "node": ">=4"
       }
     },
+    "node_modules/remark-gfm": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/remark-gfm/-/remark-gfm-4.0.1.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "mdast-util-gfm": "^3.0.0",
+        "micromark-extension-gfm": "^3.0.0",
+        "remark-parse": "^11.0.0",
+        "remark-stringify": "^11.0.0",
+        "unified": "^11.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/remark-parse": {
+      "version": "11.0.0",
+      "resolved": "https://registry.npmjs.org/remark-parse/-/remark-parse-11.0.0.tgz",
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+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "mdast-util-from-markdown": "^2.0.0",
+        "micromark-util-types": "^2.0.0",
+        "unified": "^11.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/remark-stringify": {
+      "version": "11.0.0",
+      "resolved": "https://registry.npmjs.org/remark-stringify/-/remark-stringify-11.0.0.tgz",
+      "integrity": "sha512-1OSmLd3awB/t8qdoEOMazZkNsfVTeY4fTsgzcQFdXNq8ToTN4ZGwrMnlda4K6smTFKD+GRV6O48i6Z4iKgPPpw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/mdast": "^4.0.0",
+        "mdast-util-to-markdown": "^2.0.0",
+        "unified": "^11.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/renderkid": {
       "version": "3.0.0",
       "resolved": "https://registry.npmjs.org/renderkid/-/renderkid-3.0.0.tgz",
@@ -23846,6 +24850,17 @@
         "tree-kill": "cli.js"
       }
     },
+    "node_modules/trough": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/trough/-/trough-2.2.0.tgz",
+      "integrity": "sha512-tmMpK00BjZiUyVyvrBK7knerNgmgvcV/KLVyuma/SC+TQN167GrMRciANTz09+k3zW8L8t60jWO1GpfkZdjTaw==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
+    },
     "node_modules/trouter": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/trouter/-/trouter-2.0.1.tgz",
@@ -24174,6 +25189,26 @@
         "node": ">=4"
       }
     },
+    "node_modules/unified": {
+      "version": "11.0.5",
+      "resolved": "https://registry.npmjs.org/unified/-/unified-11.0.5.tgz",
+      "integrity": "sha512-xKvGhPWw3k84Qjh8bI3ZeJjqnyadK+GEFtazSfZv/rKeTkTjOJho6mFqh2SM96iIcZokxiOpg78GazTSg8+KHA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "bail": "^2.0.0",
+        "devlop": "^1.0.0",
+        "extend": "^3.0.0",
+        "is-plain-obj": "^4.0.0",
+        "trough": "^2.0.0",
+        "vfile": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/union": {
       "version": "0.5.0",
       "resolved": "https://registry.npmjs.org/union/-/union-0.5.0.tgz",
@@ -24186,6 +25221,65 @@
         "node": ">= 0.8.0"
       }
     },
+    "node_modules/unist-util-is": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/unist-util-is/-/unist-util-is-6.0.1.tgz",
+      "integrity": "sha512-LsiILbtBETkDz8I9p1dQ0uyRUWuaQzd/cuEeS1hoRSyW5E5XGmTzlwY1OrNzzakGowI9Dr/I8HVaw4hTtnxy8g==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/unist-util-stringify-position": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/unist-util-stringify-position/-/unist-util-stringify-position-4.0.0.tgz",
+      "integrity": "sha512-0ASV06AAoKCDkS2+xw5RXJywruurpbC4JZSm7nr7MOt1ojAzvyyaO+UxZf18j8FCF6kmzCZKcAgN/yu2gm2XgQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/unist-util-visit": {
+      "version": "5.1.0",
+      "resolved": "https://registry.npmjs.org/unist-util-visit/-/unist-util-visit-5.1.0.tgz",
+      "integrity": "sha512-m+vIdyeCOpdr/QeQCu2EzxX/ohgS8KbnPDgFni4dQsfSCtpz8UqDyY5GjRru8PDKuYn7Fq19j1CQ+nJSsGKOzg==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "unist-util-is": "^6.0.0",
+        "unist-util-visit-parents": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/unist-util-visit-parents": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/unist-util-visit-parents/-/unist-util-visit-parents-6.0.2.tgz",
+      "integrity": "sha512-goh1s1TBrqSqukSc8wrjwWhL0hiJxgA8m4kFxGlQ+8FYQ3C/m11FcTs4YYem7V664AhHVvgoQLk890Ssdsr2IQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "unist-util-is": "^6.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/universalify": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/universalify/-/universalify-2.0.1.tgz",
@@ -24405,6 +25499,36 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/vfile": {
+      "version": "6.0.3",
+      "resolved": "https://registry.npmjs.org/vfile/-/vfile-6.0.3.tgz",
+      "integrity": "sha512-KzIbH/9tXat2u30jf+smMwFCsno4wHVdNmzFyL+T/L3UGqqk6JKfVqOFOZEpZSHADH1k40ab6NUIXZq422ov3Q==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "vfile-message": "^4.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
+    "node_modules/vfile-message": {
+      "version": "4.0.3",
+      "resolved": "https://registry.npmjs.org/vfile-message/-/vfile-message-4.0.3.tgz",
+      "integrity": "sha512-QTHzsGd1EhbZs4AsQ20JX1rC3cOlt/IWJruk893DfLRr57lcnOeMaWG4K0JrRta4mIJZKth2Au3mM3u03/JWKw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "@types/unist": "^3.0.0",
+        "unist-util-stringify-position": "^4.0.0"
+      },
+      "funding": {
+        "type": "opencollective",
+        "url": "https://opencollective.com/unified"
+      }
+    },
     "node_modules/vis-network": {
       "version": "10.1.0",
       "resolved": "https://registry.npmjs.org/vis-network/-/vis-network-10.1.0.tgz",
@@ -26180,6 +27304,17 @@
       "peerDependencies": {
         "zod": "^3.25.28 || ^4"
       }
+    },
+    "node_modules/zwitch": {
+      "version": "2.0.4",
+      "resolved": "https://registry.npmjs.org/zwitch/-/zwitch-2.0.4.tgz",
+      "integrity": "sha512-bXE4cR/kVZhKZX/RjPEflHaKVhUVl85noU3v6b8apfQEc1x4A+zBxjZ4lN8LqGd6WZ3dl98pY4o717VFmoPp+A==",
+      "dev": true,
+      "license": "MIT",
+      "funding": {
+        "type": "github",
+        "url": "https://github.com/sponsors/wooorm"
+      }
     }
   }
 }
diff --git a/package.json b/package.json
index 9757ddb..643f229 100644
--- a/package.json
+++ b/package.json
@@ -55,6 +55,7 @@
     "jsdom": "^29.0.0",
     "nswag": "^14.7.1",
     "prettier": "^3.8.1",
+    "remark-gfm": "^4.0.1",
     "storybook": "^10.4.6",
     "typescript": "~6.0.2",
     "typescript-eslint": "^8.62.0",
diff --git a/src/docs/i18n.mdx b/src/docs/i18n.mdx
new file mode 100644
index 0000000..3dbef7f
--- /dev/null
+++ b/src/docs/i18n.mdx
@@ -0,0 +1,93 @@
+import { Meta } from '@storybook/addon-docs/blocks';
+
+<Meta title="Foundations/Internationalization" />
+
+# Internationalization (the locale seam)
+
+Every user-visible string goes through Angular's first-party **`$localize`** — no
+third-party i18n library. The source locale is **`nl`**; a second locale is a
+**translation file, not a code change**. That's the seam: adding English touched
+`src/locale/messages.en.xlf`, not the components.
+
+## How it's wired
+
+| Piece | Where | What |
+| --- | --- | --- |
+| Source locale | `angular.json` → `i18n.sourceLocale` | `nl` — the language the code is written in |
+| Locales | `angular.json` → `i18n.locales.en` | points at `src/locale/messages.en.xlf` |
+| Missing-translation policy | `angular.json` → `i18nMissingTranslation` | `error` — a missing `<target>` fails the build |
+| Runtime global | `angular.json` → `polyfills` | `@angular/localize/init` provides `$localize` |
+| English build/serve | `angular.json` → `configurations.en` | `ng build --configuration=en`, `ng serve --configuration=en` |
+
+Locale switching is **build-time**, not runtime: each locale is its own bundle. There is
+no in-app language picker (out of scope for the POC).
+
+## Authoring copy
+
+Two forms, same custom-id rule. The id is **stable** and shaped `@@<context>.<key>`, so
+translations survive copy edits.
+
+**In TS logic / value objects — tagged template:**
+
+```ts
+// src/app/registratie/domain/value-objects/postcode.ts
+return err($localize`:@@validation.postcode:Voer een geldige postcode in, bijv. 1234 AB.`);
+```
+
+With placeholders (named, so translators can reorder):
+
+```ts
+$localize`:@@aanvraag.row.ingediend:ingediend op ${formatDatumNl(a.submittedAt)}:datum:`;
+```
+
+**In inline component templates — the `i18n` attribute:**
+
+```html
+<!-- src/app/auth/ui/login-form/login-form.component.ts -->
+<app-button type="submit" i18n="@@login.submit">Inloggen met DigiD</app-button>
+```
+
+**Shared/English components never hardcode Dutch.** They expose copy as `input()`s with
+localizable defaults; the domain caller may override. See
+`shared/ui/async/async.component.ts`:
+
+```ts
+errorText = input($localize`:@@async.error:Er ging iets mis bij het laden van de gegevens.`);
+```
+
+## Extract & translate loop
+
+```bash
+npm run extract-i18n   # ng extract-i18n → src/locale/messages.xlf (source, nl)
+```
+
+Then a translator fills `<target>`s in `src/locale/messages.en.xlf`. Both files carry the
+same trans-units (currently 690 = 690, no drift); the `.en.xlf` header is
+`source-language="nl" target-language="en"`. Because `i18nMissingTranslation: error`, a
+forgotten target breaks the `en` build rather than silently shipping Dutch.
+
+## Testing languages without coupling to the strings
+
+**Rule: never assert on rendered copy.** Copy is the thing that changes per locale and per
+edit — a test that reads `"Voer een geldige postcode in"` breaks the moment a translator or
+a product owner touches the wording, in every locale. Assert on what's *invariant* instead:
+
+- **Parsers / value objects** — assert on the `Result` discriminant and the parsed value,
+  not the error message. This is the existing house pattern
+  (`registratie/domain/value-objects/postcode.spec.ts`):
+
+  ```ts
+  expect(parsePostcode('0234AB').ok).toBe(false); // rejects — never inspects the $localize string
+  ```
+
+- **The seam itself** — if you must verify that translation works, check that a known
+  **id flips**, not that a specific phrase appears. Build/serve the `en` configuration and
+  confirm the target for a stable id renders, e.g. `login.submit`: `nl` "Inloggen met
+  DigiD" → `en` "Log in with DigiD". You're testing the wiring, not the wording.
+
+  ```bash
+  ng serve --configuration=en   # then eyeball, or point an e2e at the en bundle
+  ```
+
+See [Testing strategy](?path=/docs/foundations-testing-strategy--docs) for how this fits the
+rest of the test pyramid.
diff --git a/src/docs/testing.mdx b/src/docs/testing.mdx
new file mode 100644
index 0000000..43c1ea6
--- /dev/null
+++ b/src/docs/testing.mdx
@@ -0,0 +1,93 @@
+import { Meta } from '@storybook/addon-docs/blocks';
+
+<Meta title="Foundations/Testing strategy" />
+
+# Testing strategy
+
+Tests follow the same grain as the architecture: **push the logic down to where it's pure,
+test it there directly, and keep the layers above thin.** No single tool covers everything,
+so each layer gets the cheapest test that catches its class of bug.
+
+## What gets tested where
+
+| Layer | Test kind | Tool | Rule |
+| --- | --- | --- | --- |
+| `domain/` | pure-function unit spec | Vitest | **Required.** Call the function directly — **no `TestBed`**. Reducers, combinators, `visibleSteps`, parsers, policies. |
+| `domain/value-objects/` | parser spec | Vitest | Happy path + normalisation + **each** rejection. Assert on the `Result`, never the message. |
+| `infrastructure/` `parse*` | trust-boundary spec | Vitest | Accept a valid DTO; **reject `null` / `{}` / malformed**. Name it `describe('… (trust boundary)')`. |
+| `application/` | store / command spec | Vitest | Reducer purity, optimistic begin→confirm/rollback, command `Result`. |
+| `ui/` | Storybook story | Storybook + a11y | Kept thin. Axe runs on every story; add a `play` only for wiring axe can't see. |
+| flows | e2e smoke | Playwright | One happy path + one error state per critical journey. |
+| backend | rule + endpoint + golden | xUnit | Mirror of the FE domain rules, plus `WebApplicationFactory` integration. |
+
+## Tooling
+
+Vitest runs through Angular's built-in `@angular/build:unit-test` builder — **there is no
+`vitest.config.ts`**; config is implicit via `tsconfig.spec.json`.
+
+```bash
+npm test           # ng test → Vitest, all *.spec.ts co-located next to their unit
+```
+
+Specs import `{ describe, it, expect }` from `vitest` and are co-located with the unit
+they cover.
+
+## The house style
+
+Pure and direct. A value-object parser spec
+(`registratie/domain/value-objects/postcode.spec.ts`):
+
+```ts
+import { describe, it, expect } from 'vitest';
+import { parsePostcode } from './postcode';
+
+describe('parsePostcode', () => {
+  it('normalises to "1234 AB"', () => {
+    const r = parsePostcode(' 1234ab ');
+    expect(r.ok).toBe(true);
+    if (r.ok) expect(r.value).toBe('1234 AB');
+  });
+  it('rejects malformed input', () => {
+    expect(parsePostcode('0234AB').ok).toBe(false); // asserts the tag, not the copy
+  });
+});
+```
+
+A trust-boundary adapter (`registratie/infrastructure/brp.adapter.spec.ts`) additionally
+proves the untrusted shape is rejected:
+
+```ts
+expect(parseBrpAddress(null).ok).toBe(false);
+expect(parseBrpAddress({}).ok).toBe(false); // missing required field
+```
+
+Elm-style machines test the pure `reduce` with inline state fixtures — no Angular
+(`registratie/domain/registratie-wizard.machine.spec.ts`).
+
+## UI = Storybook, not heavy component tests
+
+`@storybook/addon-a11y` runs the `wcag2a/2aa/21a/21aa` rule sets on **every** story;
+`@storybook/test-runner` + `axe-playwright` turn that into a CI gate:
+
+```bash
+npm run test-storybook       # axe over every story against a running Storybook
+npm run test-storybook:ci    # builds storybook-static, serves :6006, runs the gate
+```
+
+Disabling a11y on a story needs an inline justification + a WP cross-reference (see
+[Accessibility](?path=/docs/foundations-accessibility--docs)).
+
+## Don't assert on copy
+
+Localized strings change per locale and per edit. Tests assert on the `Result`
+discriminant, the value object, or the message **id** — never the rendered Dutch/English
+text. Full detail in [Internationalization](?path=/docs/foundations-internationalization--docs).
+
+## The GREEN gate
+
+```bash
+npm run lint && npm run check:tokens && npm test && npm run build && npm run build-storybook
+cd backend && dotnet test
+```
+
+Everything above must pass before a work package is done.