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/index.md

@@ -2,7 +2,7 @@
 
 > Last reviewed: 2026-05-10
 
-This is the index for the per-IdP setup runbooks that ship with Auth Bundle 2 (OIDC + sessions). Pick the runbook that matches your identity provider; each one walks you through the IdP-side configuration, the certctl-side configuration, end-to-end verification, and the most common troubleshooting paths.
+This is the index for the per-IdP setup runbooks for certctl's OIDC SSO surface. Pick the runbook that matches your identity provider; each one walks you through the IdP-side configuration, the certctl-side configuration, end-to-end verification, and the most common troubleshooting paths.
 
 For the threat model behind certctl's OIDC implementation, see [`auth-threat-model.md`](../auth-threat-model.md). For the RBAC primitive that group→role mappings target, see [`rbac.md`](../rbac.md). For the underlying protocol details (PKCE, state, nonce, JWKS rotation, fail-closed semantics), see the OIDC service docstring at [`internal/auth/oidc/service.go`](../../../internal/auth/oidc/service.go).
 
@@ -35,7 +35,7 @@ These show up in every runbook; understand them once and skim the rest.
 
 **Client secret rotation.** Every IdP issues a `client_secret` for the confidential client (certctl is always a confidential client; public clients aren't supported because we have a server-side place to keep the secret). Rotating at the IdP requires the operator to PUT the new secret into certctl via the GUI's "Edit provider" dialog or `certctl_auth_update_oidc_provider` MCP tool — leaving `client_secret` empty in the update payload preserves the existing ciphertext, providing a value rotates.
 
-**JWKS cache TTL.** The certctl service caches the IdP's JWKS document for `jwks_cache_ttl_seconds` (default 3600). When the IdP rotates a signing key, in-flight logins that try to validate a new-key-signed token against the stale cache fail with `ErrJWKSUnreachable` until the next refresh. Operators have two options: wait out the TTL, or click "Refresh discovery cache" in the GUI's OIDC Provider Detail page (`POST /api/v1/auth/oidc/providers/{id}/refresh`) to force-evict the cache. The Phase 10 Keycloak integration test exercises this drill end to end.
+**JWKS cache TTL.** The certctl service caches the IdP's JWKS document for `jwks_cache_ttl_seconds` (default 3600). When the IdP rotates a signing key, in-flight logins that try to validate a new-key-signed token against the stale cache fail with `ErrJWKSUnreachable` until the next refresh. Operators have two options: wait out the TTL, or click "Refresh discovery cache" in the GUI's OIDC Provider Detail page (`POST /api/v1/auth/oidc/providers/{id}/refresh`) to force-evict the cache. The Keycloak integration test exercises this drill end to end.
 
 **Group→role mappings are fail-closed.** The certctl service refuses to mint a session for a user whose IdP-supplied groups don't match ANY configured mapping (`ErrGroupsUnmapped` → HTTP 401 to the user with a "no roles assigned" page). This is intentional — empty mapping ≠ "let everyone in," it means "this provider is not yet configured for any role." Operators add at least one mapping (typically `<engineers-group>` → `r-operator`) BEFORE rolling out OIDC to users.
 
@@ -51,5 +51,5 @@ Each per-IdP runbook ends with a **validation checklist** the operator runs agai
 
 - [RBAC operator reference](../rbac.md) — roles, permissions, scope-down + bootstrap flow.
 - [Auth threat model](../auth-threat-model.md) — API-key + OIDC + session compromise scenarios; v3 WebAuthn pairing.
-- [Security posture](../security.md) — overall auth surface incl. this Bundle 2 OIDC layer.
-- [API keys → RBAC migration](../../migration/api-keys-to-rbac.md) — the Bundle 1 upgrade flow your operator likely already ran.
+- [Security posture](../security.md) — overall auth surface including this OIDC layer.
+- [API keys → RBAC migration](../../migration/api-keys-to-rbac.md) — the v2.0.x → v2.1.0 RBAC upgrade flow your operator likely already ran.