merge: T014 ledger Dockerfile + deploy notes

ledger/Dockerfile

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+FROM python:3.12-slim
+
+WORKDIR /app
+
+# Install the ledger package itself (deps come from pyproject.toml [project.dependencies]).
+COPY pyproject.toml ./
+COPY src ./src
+RUN pip install --no-cache-dir .
+
+RUN groupadd --system ledger && useradd --system --gid ledger --home-dir /app ledger \
+    && mkdir -p /data && chown -R ledger:ledger /data /app
+USER ledger
+
+ENV LEDGER_DB_PATH=/data/ledger.db
+
+VOLUME ["/data"]
+EXPOSE 8000
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+    CMD python -c "import urllib.request; urllib.request.urlopen('http://127.0.0.1:8000/health', timeout=2)" || exit 1
+
+CMD ["uvicorn", "m2_ledger.api:app", "--host", "0.0.0.0", "--port", "8000"]

ledger/README.md

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+# m2-ledger
+
+Append-only credits ledger — transactions `{ts, from, to, amount, reason, ref}`,
+balances always derived by folding the tx log (never stored authoritatively). See
+`specs/001-market-first-wedge/contracts/ledger-api.md` (frozen v1 contract) and
+`docs/config.md` (env var / key reference) for the full spec.
+
+## Run locally
+
+```bash
+cd ledger
+uv sync
+LEDGER_DB_PATH=./ledger.db \
+LEDGER_SERVICE_KEYS=svc_devkey \
+LEDGER_ADMIN_KEYS=admin_devkey \
+  uv run uvicorn m2_ledger.api:app --reload --port 8000
+```
+
+`GET http://localhost:8000/health` should return `{"status":"healthy"}`. All other
+endpoints require an `X-API-Key` header (service or admin class — see
+`docs/config.md` §4).
+
+## Deploy as a Coolify app
+
+`m2-ledger` is the one sanctioned new service in the first wedge (constitution I);
+it deploys as a plain Coolify app on the `coolify` Docker network, not baked into
+any image.
+
+1. **Build**: point the Coolify app at this repo/subpath (`ledger/`) with
+   `ledger/Dockerfile` — no build args, no secrets at build time (constitution VI:
+   no secrets in repos or images).
+2. **Network + alias**: attach the app to the `coolify` network with alias
+   `m2-ledger`, so callers use `http://m2-ledger:8000` per the frozen contract's
+   base URL.
+3. **Env vars** (inject at runtime via Coolify's environment panel — never commit
+   real values, see `docs/config.md` §5):
+   - `LEDGER_DB_PATH=/data/ledger.db` (already set as the image default; override
+     only if the persistent volume is mounted elsewhere)
+   - `LEDGER_SERVICE_KEYS` — comma-separated `service`-class keys (CLI/Store/indexer)
+   - `LEDGER_ADMIN_KEYS` — comma-separated `admin`-class keys (grants, snapshots);
+     keep this set small
+   - `LEDGER_PLATFORM_PCT` (default `0.10`, UNCONFIRMED) and `LEDGER_STARTER_GRANT`
+     (default `100`, UNCONFIRMED) — optional, override the code defaults
+   - `REGISTRY_REPO_URL` + `FORGEJO_TOKEN` — required once `/snapshot` actually
+     commits to `m2/market-registry` (see TODO below)
+4. **Persistent volume**: mount a Coolify persistent volume at `/data` (the image
+   declares `VOLUME /data`) so `ledger.db` survives redeploys. This is the single
+   source of truth for the tx log — never point it at ephemeral container storage.
+5. **Health check**: the image's `HEALTHCHECK` hits `GET /health` (no auth). Coolify
+   should also be configured to poll the same endpoint for its own readiness gate.
+6. **Canary-first** (constitution VI): roll out to one environment before any
+   fleet-wide dependency on `m2-ledger` — there is no fleet-wide blast for this
+   service since it's a single shared instance, but verify `/health` and one
+   `/balance/{operator_id}` call with a real service key before pointing the CLI's
+   `ledger_url` at it in `~/.m2-market/config.toml`.
+
+## Snapshot cron (TODO T034)
+
+`POST /snapshot` (admin) currently computes `audit/YYYY-MM-DD.json` balances and
+returns the JSON body but does **not** commit it anywhere — see the
+`TODO(T034)` in `src/m2_ledger/api.py`. Once T034 lands (Forgejo commit via
+`REGISTRY_REPO_URL` + `FORGEJO_TOKEN`), add a daily Coolify scheduled task (or
+cron container) that calls `POST /snapshot` with an admin key once every 24h,
+per constitution V ("Daily balance snapshots MUST be committed to Forgejo for
+audit") and the contract's "admin, also daily cron" note. Not wired up yet.