telemetry step 2: API boot/health + forge.auth.failed (declared)

Membrane first: I-2 and MEMBRANE.v1 now list the windy-admin ledger
(POST /v1/events). api/app/telemetry.py: service.boot once per start
(commit_sha omitted when unknown, I-12), an hourly in-process
service.health with the shared keys (requests, errors_5xx/4xx,
refusals_4xx, p95_ms only when there was traffic), and one
forge.auth.failed row per refused request: declared 13-code enum,
http_status, caller class, route TEMPLATE (never the concrete path),
actor_type system with no actor_id (all-lanes rule). No token = nothing
sent or buffered; flush failures keep rows (bounded) and never raise.
Token from root-only /etc/windygit/telemetry.env (optional env_file).
8 behavioural tests.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docker-compose.yml

@@ -16,7 +16,11 @@ services:
         # I-12: baked at build time. A runtime COMMIT_SHA override is ignored.
         COMMIT_SHA: ${COMMIT_SHA_BUILD:-}
         BUILT_AT: ${BUILT_AT:-}
-    env_file: [.env]
+    env_file:
+      - .env
+      # WINDYGIT_TELEMETRY_TOKEN (root-only on Veron). Optional: no file = no telemetry.
+      - path: /etc/windygit/telemetry.env
+        required: false
     environment:
       DATABASE_URL: postgresql+asyncpg://windygit:${POSTGRES_PASSWORD:?set POSTGRES_PASSWORD}@db:5432/windygit
       GITEA_BASE_URL: http://gitea:3000