REUSE-WP-0019: record live webhook secret addition

REUSE_SURFACE_FORGEJO_WEBHOOK_SECRET added to the reuse-surface-env K8s
Secret and the deployment restarted to pick it up, per explicit user
sign-off. Live-verified: a correctly-signed webhook push is now accepted,
a bad signature still 401s, other endpoints unaffected by the restart.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

workplans/REUSE-WP-0019-forgejo-automation-and-telemetry.md

@@ -161,12 +161,20 @@ real forced recompose via `POST /v1/federated/compose` (token-auth via
 correctly failing closed with 503 (`REUSE_SURFACE_FORGEJO_WEBHOOK_SECRET`
 not yet configured).
 
-**Deliberately not done — needs separate explicit sign-off:** writing the
-new `REUSE_SURFACE_FORGEJO_WEBHOOK_SECRET` value into the live K8s Secret
-`reuse-surface-env` was blocked by the auto-mode classifier as a
-credential-establishment action distinct from "deploy to live" — did not
-attempt to work around it. The webhook endpoint is deployed and will work
-correctly once that specific step is authorized and done.
+**Webhook secret added 2026-07-07 (explicit user sign-off "Go ahead and
+add the webhook secret"):** generated a fresh 32-byte hex secret with
+`openssl rand -hex 32`, patched it into the live K8s Secret
+`reuse-surface-env` in namespace `reuse`, restarted the deployment (values
+injected via `envFrom.secretRef`, not picked up without a restart) — pod
+rolled cleanly (`1/1 Ready`, 0 restarts). The raw secret value was never
+printed to the transcript: generated and applied in one non-echoing shell
+step, and re-fetched only inside an exported env var for the live
+signature-verification test below, then unset. Live-verified against
+production: a correctly HMAC-signed push payload is now accepted
+(`{"accepted": false, "reason": "no registry/indexes/ change"}` for a
+payload that doesn't touch `registry/indexes/`, as designed), and a bad
+signature is still rejected with 401. `/v1/federated` and `/v1/repos`
+unaffected by the restart.
 
 **Found (not fixed) while smoke-testing:** the public ingress's exact-path
 `/health` rule 404s at the Traefik edge (shadowed by the catch-all `/`