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>

docs/MEMBRANE.v1.md

@@ -15,6 +15,7 @@ Mirrored into `windy-cloud` and `eternitas` on change.
 | eternitas | `GET /api/v1/trust/{passport}` | band + allowed_actions |
 | eternitas | `GET /api/v1/registry/{passport}/integrity` | ⚠️ note the path — `windy-registry` calls `/api/v1/passports/{p}/status`, which 404s, which is why the integrity index has never been populated |
 | account-server | OIDC discovery + JWKS | human identity (G3.1) |
+| windy-admin ledger | `POST /v1/events` (admin.windyword.ai) | field telemetry: `ci.run`, `ci.job_cancelled`, `service.boot`, `service.health`, `forge.auth.failed`. Shapes are declared with the ledger owner BEFORE shipping (the server quarantines undeclared keys). Codes, counts, route templates only |
 | windy-cloud-sites | `POST /api/v1/sites/{id}/versions` | publish docs from a repo |
 
 ## Calls IN