feat(nats): per-license auth mechanism — agent user/password, scoped broker, generator (non-breaking)

Closes the open broker (anonymous publish to any tenant's corrosion.*).
Per-license isolation via NATS user/password + subject permissions:
each license -> user=license_id, password=HMAC-SHA256(license_id,
NATS_TOKEN_SECRET), scoped to corrosion.{license_id}.> + _INBOX. Backend
uses a privileged internal user.

- Agent (alpha.5): nats_user/nats_password config + env, user_and_password
  auth; falls back to token/anonymous (transition-safe)
- Backend: connects with NATS_INTERNAL_USER/PASSWORD when set, else anon
- scripts/generate-nats-auth.mjs: regenerates nats-auth.conf from the
  licenses table; NATS_AUTH_STAGE=open keeps a no_auth_user fallback
  (verify creds first), =enforce rejects anonymous
- committed nats-auth.conf is the SAFE OPEN default (no secrets); the
  host copy carries real users and is not committed
- compose: NATS_INTERNAL_USER/PASSWORD/NATS_TOKEN_SECRET, mount nats-auth.conf

Entirely non-breaking until secrets+config deployed; staged cutover next.

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

docker/nats-auth.conf

@@ -0,0 +1,12 @@
+# SAFE OPEN DEFAULT — anonymous full access, no secrets. Same behavior as the
+# pre-auth broker so fresh deploys and the repo stay valid.
+#
+# Regenerated on deploy by scripts/generate-nats-auth.mjs with the privileged
+# internal user + per-license scoped users (those carry secrets and must NOT be
+# committed — mark the host copy with `git update-index --assume-unchanged`).
+authorization {
+  users: [
+    { user: "anonymous", password: "", permissions: { publish: ">", subscribe: ">" } }
+  ]
+  no_auth_user: "anonymous"
+}