Document the auth security model in README

todo.md

@@ -14,8 +14,8 @@
 - [x] CI/CD - Renovate: set a read-only `GITHUB_COM_TOKEN` env in `renovate.yml` so Renovate stops hitting github.com rate limits when resolving github-hosted deps (Playwright, lucide, `actions/checkout`) and can fetch changelogs. Non-blocking refinement; needs a read-only GitHub PAT stored as an Actions secret. (The renovate job forwards the `RENOVATE_GITHUB_TOKEN` secret — a scopeless read-only github.com PAT; Gitea rejects `GITHUB_`-prefixed secret names — into the container as `GITHUB_COM_TOKEN`; documented in README → CI/CD.)
 - [x] CI/CD - When renovate updates a dependency - also release a new version of plainpages based on what got updated with Renovate. Major typescript? New apiVersion + new major. A tiny patch to ejs? Only patch release etc. Before implementing, explain in detail how you will solve this. (`renovate.yml` gains an `auto-release` job (`needs: renovate`) that cuts one `vX.Y.Z` tag per run for what Renovate merged; level = highest `Release-Bump:` trailer Renovate stamps via `commitBody`, any dep's major/minor/patch mapped straight through (default patch). Decoupled from `apiVersion` (tag-only, `HOST_API_VERSION` untouched — a "major" is just a bigger image tag, never a plugin break); pre-1.0 shifts down so nothing auto-crosses into 1.0.0. Pure `auto-release/next-version.ts` + unit tests; tag pushed with renovate-bot's PAT so `release.yml` fires; documented in README → CI/CD.)
 - [x] Add an e2e test for the admin plugin's OAuth2-clients (Hydra) screen. The full-flow e2e suite runs without Hydra (compose.full.yml), so /admin/clients register/detail/delete is only unit-covered (src/http/app.test.ts); wire Hydra into an e2e stack and drive the screen in the browser. (compose.full.yml now includes Hydra (`serve all --dev`) and full-flow.spec.ts drives /admin/clients register → one-time secret → list → detail → delete in the browser; documented in README → Testing.)
-- [ ] Build and publish docker image as CI/CD.
-- [ ] The human developer understands the security model in the auth in this project.
+- [x] Build and publish docker image as CI/CD. (Duplicate of the CI/CD items above: `ci.yml` builds and pushes `gitea.larvit.se/larvit/plainpages:<commit hash>` behind the green gate, `release.yml` re-tags it to semver and syncs those tags to Docker Hub.)
+- [x] The human developer understands the security model in the auth in this project. (README → Auth → [Security model](README.md#security-model): trust boundaries — browser untrusted, JWT untrusted until verified, the private network as the *only* guard on the unauthenticated Ory admin APIs, plugins trusted and unsandboxed, row rules upstream — plus a threat→defense table, the fail-closed rule, and pointers to the limits that are deliberately not guaranteed. Signed-not-encrypted is called out so nothing secret lands in a claim. Every claim it makes is already enforced by an existing test.)
 - [ ] Add i18n support.
 
 ## Architectural review findings (2026-07-02)