docs: replace SHOWCASE-ROADMAP.md with docs/backlog/ (17 WPs)

Turns the prior roadmap sketch into ordered, gated work packages (enforcement
gates, FP/DDD consistency, CIBG fidelity, Storybook curriculum, a11y) from the
2026-07-02 showcase-hardening audit.

docs/backlog/WP-17-app-a11y.md

@@ -0,0 +1,82 @@
+# WP-17 — App-level a11y: route focus/scroll, template lint, WCAG checklist + MDX
+
+Status: todo
+Phase: 4 — a11y
+
+## Why
+
+Three app-level gaps close the WCAG story:
+- **No route-change focus/scroll management** — `app.config.ts` has only
+  `provideRouter(routes, withViewTransitions())`; after navigation, focus stays wherever
+  it was and scroll position is unmanaged. (The wizard manages focus *within* steps; the
+  skip link is the only cross-page mechanism.)
+- **No template a11y linting** — `@angular-eslint` is entirely absent.
+- User decision: a **manual WCAG checklist** documents what automation can't test.
+
+## Read first
+
+- `src/app/app.config.ts`
+- `eslint.config.mjs`, `package.json`
+- `src/app/shared/layout/shell/shell.component.ts` (`#main` target),
+  `page-shell/page-shell.component.ts` (candidate focus target)
+
+## Decisions (pre-made, don't relitigate)
+
+- Scroll: `withInMemoryScrolling({ scrollPositionRestoration: 'enabled' })`.
+- Focus: on `NavigationEnd`, move focus to the new page's `h1` (or `#main` fallback,
+  `tabindex="-1"`), **deferred via `afterNextRender`** so it coexists with view
+  transitions; skip the initial load. Implement as a small root service/effect wired in
+  `app.config.ts` — not per page.
+- Lint: `angular-eslint` at the version matching Angular 22 (~v21+ — check
+  `npm view angular-eslint peerDependencies`), with `processInlineTemplates` (this repo
+  has **no** `.html` templates). Rules: `alt-text`, `label-has-associated-control`,
+  `interactive-supports-focus`, `click-events-have-key-events`, `valid-aria`,
+  `elements-content`. **Verify the processor fires** by planting a known-bad pattern
+  before trusting green.
+- The checklist is a living doc with per-page status columns — not prose.
+
+## Files
+
+- `src/app/app.config.ts` + a new small `shared/` focus-on-navigation service
+- `eslint.config.mjs`, `package.json` (angular-eslint)
+- Any template the new lint rules flag
+- New `docs/wcag-checklist.md`
+- New `src/docs/a11y.mdx` — title `Foundations/Accessibility`
+
+## Steps
+
+1. Router scroll + focus service; manual keyboard smoke (tab through, navigate, confirm
+   focus lands on the new page's heading).
+2. Add angular-eslint; enable the template rules on inline templates; plant a bad
+   pattern, see it fail, remove it; fix real hits.
+3. `docs/wcag-checklist.md`: manual checks per page (dashboard, wizards, brief, login) —
+   keyboard walk & focus order, no traps, 200% zoom/reflow, NVDA or VoiceOver pass,
+   visible focus, error announcement; status columns (page × check).
+4. `src/docs/a11y.mdx`: the layered approach — axe gate (WP-01) + template lint + play
+   tests (WP-16) + manual checklist; the alert-role rationale; where the
+   `a11y.disable` skip register lives and its rules.
+
+## Acceptance criteria
+
+- [ ] Navigating between routes moves focus to the new page's heading; scroll resets;
+      view transitions still play.
+- [ ] Template a11y rules active and *proven* to fire; lint green.
+- [ ] Checklist checked in with an initial pass filled in for the dashboard at minimum.
+- [ ] `a11y.mdx` renders; links to checklist and WP-01 skip rules.
+
+## Verification
+
+GREEN + `npm run test-storybook:ci`. Manual: keyboard-only walk of
+login → dashboard → wizard → brief.
+
+## Out of scope
+
+Full manual audit of every page (the checklist enables it; filling it beyond the
+dashboard is ongoing work, not this WP).
+
+## Risks
+
+- angular-eslint's inline-template processor silently not running → the planted-violation
+  step is mandatory.
+- Focus-move vs `withViewTransitions` timing → `afterNextRender` + test in a real browser
+  (`npm start`), not just unit-level.