# Changelog

The binding policy for what each kind of version bump means and what
the changelog has to carry is in [`SPEC.md` §20](./SPEC.md). The
practical recipe downstream deployments follow when reading this file
is in [`docs/DEPLOYMENTS.md`](./docs/DEPLOYMENTS.md).

The canonical version is the `VERSION` file at the repo root;
`frontend/package.json#version` mirrors it. Deployments pin to a
specific framework version in their own `.rfc-app-version` file
(per §20.5).

While the framework is pre-1.0, minor-version bumps may introduce
breaking changes; the entry below each such bump documents the
upgrade steps a deployment must apply.

Upgrade-steps blocks use the [RFC 2119](https://www.rfc-editor.org/rfc/rfc2119)
/ [RFC 8174](https://www.rfc-editor.org/rfc/rfc8174) normative-
language convention per `SPEC.md` §20.4. **MUST** / **SHALL** steps
are required; **SHOULD** steps are recommended (the framework's
default and tested path); **MAY** steps are optional. Upgrades that
skip versions are the composition of each intervening adjacent
release's steps in order — no A-to-B path is pre-computed beyond
that.

## 0.2.3 — 2026-05-26

**Patch — no operator action required.** Rebuild and restart per the
routine deploy steps; no `.env` changes, no schema changes, no
behavior changes a deployment would notice in steady state beyond
the new endpoint below.

### Added

- **`GET /api/health`** — an unauthenticated probe returning JSON
  `{version, status}` for ops tooling. `version` is the running
  framework version (the contents of `VERSION` per §20.1, read at
  process start and cached as a module-level constant in
  `backend/app/health.py`); `status` is `"ok"` with HTTP 200 in
  v1. The `"degraded"` / HTTP 503 path stays reserved in the
  response shape so a later release can wire real degradation
  conditions without breaking the contract. The version-match
  check is the structural value — a deploy-control-panel polling
  the endpoint after `systemctl restart` catches the failure mode
  where a restart did not pick up the new code. See `SPEC.md` §17
  and the §19.2 settlement.

### Upgrade steps (from 0.2.2)

1. The deployment **MAY** configure its monitoring (Pingdom,
   Healthchecks.io, the flotilla deploy control panel, etc.) to
   probe `/api/health` and compare the returned `version` against
   the tag last deployed. The endpoint is unauthenticated by
   design — no PII in the payload, no session required.

## 0.2.2 — 2026-05-26

**Patch — no operator action required.** Rebuild the frontend and
restart per the routine deploy steps; no `.env` changes, no schema
changes, no behavior changes a deployment would notice in steady
state beyond the fix below.

### Fixed

- **Mermaid blocks rendered as raw code on `/philosophy`.**
  `frontend/src/components/Philosophy.jsx` parsed PHILOSOPHY.md with
  the bare `marked` import and `dangerouslySetInnerHTML`, so
  ```` ```mermaid ```` fences fell through as `<pre>` blocks rather
  than rendered diagrams. Swapped to `MarkdownPreview`, which already
  carries the lazy mermaid loader + SVG render path used by the RFC
  body view, so the philosophy surface now renders mermaid the same
  way RFC bodies do. Pre-existing gap, surfaced when a deployment
  authored a mermaid block in its `PHILOSOPHY_PATH` override.

## 0.2.1 — 2026-05-26

**Patch — no operator action required.** Rebuild the frontend and
restart per the routine deploy steps; no `.env` changes, no schema
changes, no behavior changes a deployment would notice in steady
state.

### Fixed

- **PR view blank page (React #310).** `frontend/src/components/PRView.jsx`
  declared its `threadsByKind` `useMemo` *after* the early-return
  guard for the loading state (`if (!pr) return …`). On first mount
  `pr` was null so the early return fired and 14 hooks were called;
  on the second render `pr` was populated and execution reached the
  `useMemo`, calling 15 hooks — violating the Rules of Hooks and
  unmounting the page subtree (blank screen). The `useMemo` is now
  declared above the early returns with optional-chaining on `pr`,
  keeping the hook count stable between the loading and loaded
  renders. Pre-existing bug in the post-Contribute-rewrite PR view;
  surfaced in production by 0.2.0's graduation merge race fix
  enabling the workflow that opens this code path.

## 0.2.0 — 2026-05-26

**Breaking config change.** The frontend now requires
`VITE_APP_NAME` to be set at build time. `npm run build` fails with a
clear message if it is missing. There is no default; every deployment
names itself.

### Upgrade steps (from 0.1.0)

1. The deployment **MUST** create a `frontend/.env` file before
   building. See `frontend/.env.example` for the contract.
2. The deployment **MUST** set `VITE_APP_NAME` in `frontend/.env` to
   the user-visible name it wants to ship — the string used as the
   browser tab title, the header brand, and the landing H1. The
   build will fail loudly if this is unset or blank.
3. The deployment **MUST** rebuild the frontend (`npm install && npm
   run build`) and redeploy the resulting bundle. The previous
   bundle does not read `VITE_APP_NAME`.
4. The deployment **SHOULD** verify the name appears correctly in
   the browser tab and the header after redeploy before bumping its
   `.rfc-app-version` pin to `0.2.0`.
5. The deployment **MAY**, in the same upgrade, take the opportunity
   to retire any local overrides it was using to brand the
   pre-0.2.0 hardcoded strings — those overrides are now obsolete.
6. The deployment **MUST NOT** continue to expect graduation step 4
   to fail on Gitea's "Please try again later" race; that path is
   now handled by `wait_for_mergeable` + bounded retry. Any local
   workaround retrying graduation at the deployment level is now
   redundant and **SHOULD** be removed.

### Fixed

- **Graduation merge race.** §13.3 step 4 (`merge_pr`) used to call
  Gitea's merge endpoint the instant step 3 returned, which races
  Gitea's background mergeability computation and produces the
  `405 "Please try again later"` response. Step 4 now waits for the
  `mergeable` field to become non-null (bounded by a 30s timeout) and
  retries the merge call up to three times on the transient response.
  See `backend/app/gitea.py#wait_for_mergeable` and
  `backend/app/bot.py#_merge_with_retry`.

### Changed

- `frontend/src/App.jsx` header brand reads `VITE_APP_NAME` instead of
  a hardcoded string.
- `frontend/src/components/Landing.jsx` H1 reads `VITE_APP_NAME`
  instead of a hardcoded string. The pitch / deck / attribution copy
  in this file is still deployment-specific and tracked as a follow-up
  for extraction into deployment config.
- `frontend/index.html` `<title>` is rewritten at build time via Vite's
  HTML transform.

### Added

- `frontend/.env.example` documenting the new required variable.
- Top-level `VERSION` file and this `CHANGELOG.md` as the canonical
  release log.
- `SPEC.md` §20 (versioning and downstream deployments) as the
  binding policy for the framework/deployment relationship.
- `docs/DEPLOYMENTS.md` as the practical guide for building on
  rfc-app and upgrading existing deployments to new versions.
- `CLAUDE.md` at the repo root capturing the separation-of-concerns
  rule for working sessions.

## 0.1.0 — v1 build

Initial release. See `docs/DEV.md` for the slicing plan and build
history.