docs: v2.1.0 release polish — strip internal bundle/phase tags, update status for OIDC ship

README:
- Rewrite Status block: drop the stale 'federated identity not yet
  shipped' line; flag v2.1.0 OIDC + sessions + back-channel logout
  + break-glass as early-access; encourage GitHub issues for IdP
  rough edges. (A1 framing — keep early-access umbrella, no
  SAML/WebAuthn/JIT roadmap teaser.)
- Add OIDC SSO bullet to 'What it does' covering per-IdP runbooks,
  group-claim → role mapping, AES-256-GCM client_secret encryption,
  JWKS auto-refresh, PKCE-S256, RFC 9700 §4.7.1 pre-login binding,
  RFC 9207 iss check, __Host- cookies, CSRF rotation, idle+absolute
  expiry, BCL, break-glass admin.
- Update Security paragraph: three auth paths (API keys / OIDC /
  break-glass), HMAC-signed sessions, CSRF rotation, RFC OIDC BCL.
- Correct CI coverage thresholds against
  .github/coverage-thresholds.yml (service 70%, handler 75%,
  crypto 88%, auth packages 85-95%); 'static analysis' replaces
  the inflated '11 linters' claim (actual count is 4 active).

Docs B3 sweep — strip operator-facing 'Bundle N' / 'Phase N' tags:
- docs/operator/auth-threat-model.md — rewrite intro; rename 5 H2
  sections (API-key + RBAC defenses / OIDC + sessions + break-glass
  defenses / OIDC + sessions threat catalogue / Closed federated-
  identity threats / Future-work threats); clean ~12 H3/prose hits.
- docs/operator/rbac.md — strip Bundle 1 framing from intro,
  scope_id deferral note, MCP tools section, day-0 bootstrap, and
  'Where to look next'.
- docs/operator/auth-benchmarks.md — drop 'Phase 14' framing from
  title intro, hardware floor caption, result table caption,
  methodology, and pre-merge audit section.
- docs/operator/security.md — already cleaned earlier this session
  (RBAC / day-0 / approval-bypass / OIDC federation / sessions /
  OIDC first-admin / break-glass H3s).
- docs/operator/oidc-runbooks/{index,keycloak,authentik,okta,
  azure-ad}.md — strip Auth Bundle 2 framing + Phase 10/3/4
  references; replace with feature-name prose.
- docs/operator/legacy-clients-tls-1.2.md — drop Bundle F / M-023
  audit-reference framing; keep CWE-326.
- docs/operator/database-tls.md — drop Bundle B / M-018 framing
  from intro + Helm section.
- docs/operator/runbooks/disaster-recovery.md — drop 'Production
  hardening II Phase 10' status callout.
- docs/migration/oidc-enable.md — retitle 'Enable OIDC SSO';
  strip Bundle 1/2 framing from prereqs, troubleshooting, related
  docs; update __Host- cookie callout from 'audit MED-14' to
  v2.1.0-BREAKING.
- docs/migration/api-keys-to-rbac.md — strip Bundle 1 framing from
  intro, migration table, IsAdmin section, and cross-references.
- docs/migration/acme-from-cert-manager.md — strip residual
  'Phase 5' tags from cert-manager integration test references.
- docs/reference/configuration.md — retitle Auth section.
- docs/reference/profiles.md — strip Bundle 1 Phase 9 framing
  from RequiresApproval section + Related list.
- docs/reference/auth-standards-implemented.md — rewrite intro
  (API-key + RBAC + OIDC + sessions + back-channel logout +
  break-glass); rename 'Bundle 1 (RBAC) standards covered
  separately' H2; clean per-row Phase references.
- docs/README.md — rewrite nav-table entries to drop Bundle 1/2
  parentheticals; retitle 'Enable OIDC SSO' migration entry.

No code or test changes; pure operator-facing prose polish for
the v2.1.0 tag.

docs/operator/oidc-runbooks/okta.md

@@ -112,7 +112,7 @@ End-to-end login + audit + Sessions checks are identical to Keycloak.
 
 **Okta-specific:** the audit row's `details.subject` will be Okta's user UID (a 20-char alphanumeric string starting with `00u`), stable across email changes. The certctl `users` table's `oidc_subject` column will hold this UID.
 
-**Optional Okta smoke test in CI:** Phase 10 ships an opt-in smoke test at `internal/auth/oidc/integration_okta_smoke_test.go` (build tags `integration && okta_smoke`). Set `OKTA_ISSUER` + `OKTA_CLIENT_ID` + `OKTA_CLIENT_SECRET` env vars and run `make okta-smoke-test` to drive a discovery + RefreshKeys round-trip against your live tenant. Pre-reqs: enable the Resource Owner Password (ROPC) grant on the application (Sign-On tab → Grant types → Resource Owner Password) for the smoke test only; production certctl uses auth-code-with-PKCE.
+**Optional Okta smoke test in CI:** certctl ships an opt-in smoke test at `internal/auth/oidc/integration_okta_smoke_test.go` (build tags `integration && okta_smoke`). Set `OKTA_ISSUER` + `OKTA_CLIENT_ID` + `OKTA_CLIENT_SECRET` env vars and run `make okta-smoke-test` to drive a discovery + RefreshKeys round-trip against your live tenant. Pre-reqs: enable the Resource Owner Password (ROPC) grant on the application (Sign-On tab → Grant types → Resource Owner Password) for the smoke test only; production certctl uses auth-code-with-PKCE.
 
 **JWKS-rotation drill:** Okta auto-rotates signing keys every ~3 months and publishes the new key alongside the old in the JWKS doc for ~1 month overlap. Manual rotation: **Security → API → Authorization Servers → default → Keys → "Generate new key"**. After rotation, click "Refresh discovery cache" in certctl's GUI; new tokens validate immediately.