feat(studio): provider management, model router, gateway + controller provider routes

docs/design/PRODUCTION-READINESS.md

@@ -46,7 +46,7 @@ record; current behaviour is in the linked [architecture](../architecture.md) do
 | mecak8s (storage-free k8s-native agent) | ✅ shipped (MVP) · ✅ OPT-IN `/metrics` loopback scrape + OTLP push (ADR 0098) · ✅ verified external Redis TLS/ACL with transactional projected-file reload + last-valid generations (ADR 0240) · ✅ Helm 0.3.0 secure real-provider in-pod TLS+OIDC or edge-terminated TLS+OIDC (ClusterIP h2c), nullable spend ceilings, and pod scheduling controls · ⛔ CRD/Operator · ⛔ HPA (custom-metrics on active-runs) · ⛔ managed Redis provisioning (ElastiCache/MemoryStore — endpoint only) · ⛔ fix `mecated`'s unbounded `GracefulStop` (pre-existing, follow-up) | [mecak8s.md](../adr/0048-mecak8s.md) · [0098](../adr/0098-headless-telemetry.md) · [0240](../adr/0240-mecak8s-credential-reload-and-chart-security.md) · [0278](../adr/0278-mecak8s-edge-terminated-tls.md) · [MECAK8S-PLAN.md](./MECAK8S-PLAN.md) | [overview](../architecture.md) |
 | ACP adapter (editor stdio surface) | ✅ Phase 1+2 + bounded Phase 3 + multimodal shipped · ⛔ Phase 3 long-tail (rule persistence, grep-over-buffers, fs/* on resume) | [0001-acp-adapter.md](../adr/0001-acp-adapter.md) | [api surface](../architecture/api-surface.md) |
 | Conversation fork (peer session from a history snapshot) | ✅ shipped · ✅ effort override (mid-conversation effort switch, keeps the transcript — [0068](../adr/0068-effort-change-via-fork.md)) · ⛔ cross-provider/model fork (v2: replay-blob stripping) · ⛔ workspace-branching fork · ⛔ fork-from-event-log-at-arbitrary-point · ⛔ fork lineage (`forked_from` label) | [0065-conversation-fork.md](../adr/0065-conversation-fork.md) | [overview](../architecture.md) |
-| Studio (web client) | 🚧 landing as a stacked PR series: ✅ module foundation (vendored Atrium UI kit, toolchain, CI gates) · ✅ server tier (trusted proxy + managed-mode controller core, hermetic suite) · ✅ protocol seam + harness transport · ✅ workspace shell + runtime status · ✅ Chats core + hermetic browser e2e (fixture daemon) · ✅ Scheduled (authoring, carried-spec edit, fire log + per-fire transcripts) · ✅ Skills (browse/create/upload/enable-disable, controller-mediated; learned-skills panel) · ✅ Memory (read-only table + detail + consolidate, honest disabled/empty states) · ✅ Settings core (Personalize, agent identity, learning review) · ⛔ provider/model-router/gateway settings · ⛔ advanced chat tiers (attachments, steer/queue, threads, re-attach, modes, mobile) | [0288](../adr/0288-studio-atrium-module.md) · [0289](../adr/0289-studio-server-backed-chats.md) | [overview](../architecture.md) |
+| Studio (web client) | 🚧 landing as a stacked PR series: ✅ module foundation (vendored Atrium UI kit, toolchain, CI gates) · ✅ server tier (trusted proxy + managed-mode controller core, hermetic suite) · ✅ protocol seam + harness transport · ✅ workspace shell + runtime status · ✅ Chats core + hermetic browser e2e (fixture daemon) · ✅ Scheduled (authoring, carried-spec edit, fire log + per-fire transcripts) · ✅ Skills (browse/create/upload/enable-disable, controller-mediated; learned-skills panel) · ✅ Memory (read-only table + detail + consolidate, honest disabled/empty states) · ✅ Settings core (Personalize, agent identity, learning review) · ✅ provider management + model router + MCP gateway (controller-mediated; server-side auth.yaml ownership, no key material on the wire) · ⛔ external-mode OIDC sign-in · ⛔ advanced chat tiers (attachments, steer/queue, threads, re-attach, modes, mobile) | [0288](../adr/0288-studio-atrium-module.md) · [0289](../adr/0289-studio-server-backed-chats.md) | [overview](../architecture.md) |
 | _Historical / retired_ | — | [ARCHITECTURE.md](../adr/0004-v1-architecture.md) · [STEP-CHAIN.md](../adr/0006-v1-step-chain.md) · [TWELVE-PATTERNS-AUDIT.md](../adr/0007-twelve-patterns-audit.md) · [REPOMAP-TREE-SITTER.md](../adr/0029-repomap-tree-sitter.md) | — |
 
 ## Security