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ehoandClaude Haiku 4.5 ddec15ccb2 docs(architecture): add diagrams and implementation playbook
Added three new documents with nine Mermaid diagrams to make the strangler
fig strategy visible:

- README: container topology diagram at the start, with the proxy entry point
  and three seams labelled
- docs/architecture.md: five diagrams tracing the exact implementation:
  - The four seams and who holds authority at each boundary
  - How by-id read goes through the resolver, but list-read bypasses it
  - Case lifecycle state machine (the strategy in one picture)
  - Take-ownership sequence with failure windows annotated
  - Write-through error round-trip showing zero validation logic crossed
- docs/playbook.md: how to apply this to a production system:
  - Write-path decision tree (five read/write patterns)
  - Cutover ordering diagram (side-effects-free first, least recoverable last)
  - Seven transferable rules with pointers to the files that demonstrate them
  - Scope diagram of what's proven vs. left as your decisions

Resolved all 13 dangling § citations (to an absent spec doc) by linking to
the actual files or dropping them. Replaced portal-frontend/README.md
boilerplate with accurate content. All diagrams parse and link-check clean.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
2026-08-01 09:15:39 +02:00

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Markdown

# portal-frontend
Session 2's Angular portal — the real UI over the new backend, reachable at
**http://localhost:8080/portal** once the stack is up (`docker compose up -d`
from the repo root). It is served by its own nginx container behind the shared
proxy, *not* by `ng serve`.
The whole app is driven off the API's `actions` and `seams` blocks: it renders
whatever write path each case advertises (`writeThrough`, `redirect`, `owned`,
`transition`, `query`) and never builds an endpoint URL from an id. That is
what makes the same screens work unchanged for a legacy-owned case and an
adopted one — see [`docs/architecture.md`](../docs/architecture.md).
```
npm test # unit tests (vitest, via ng test)
npm run build # production build
```
This app is **zoneless**: state written from a `subscribe` callback must land
in a signal, or the DOM will not update.