docs: scrub MCPLOCAL_MCPD_TOKEN — pod has no persistent mcpd identity

The earlier plan recommended an MCPLOCAL_MCPD_TOKEN env var so the pod
would have a ServiceAccount session into mcpd. It's unnecessary: the
pod forwards every inbound client bearer (mcpctl_pat_...) verbatim to
mcpd for all downstream calls — both introspect and project discovery.
mcpd's auth middleware dispatches on the prefix and resolves the
McpToken principal directly. No pod secret, no rotation story.

Updates:
- serve.ts header: explicit "identity model" section calling this out
  so future readers don't restore the env var thinking it's missing.
- docs/mcptoken-implementation.md: drop the "mount MCPLOCAL_MCPD_TOKEN"
  Pulumi guidance and the "dedicated ServiceAccount" follow-up item;
  state the correct image URL (internal 10.0.0.194 registry) and the
  gated-vs-ungated rule for LLM config mounts.

No runtime code changes — serve.ts never actually required the token;
this just fixes the documentation and the header comment.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

docs/mcptoken-implementation.md

@@ -126,8 +126,9 @@ The extracted `parseRoleBinding` helper is what PR 3's `mcpctl create mcptoken -
 
 ### Deploy-time steps still owed (outside this repo)
 
-- **Pulumi (`../kubernetes-deployment`, stack `homelab`)** — add a `Deployment` named `mcplocal` in ns `mcpctl` pointing at the new image, a `Service` named `mcp` (port 3200→80), an `Ingress` for `mcp.ad.itaz.eu` with TLS via the existing cluster-issuer, a PVC `mcplocal-cache` (10Gi RWO), a Secret `mcplocal-env` with `MCPLOCAL_MCPD_URL` + `MCPLOCAL_MCPD_TOKEN`, and a NetworkPolicy mirroring mcpd's. `fulldeploy.sh` already runs `pulumi preview` first and halts on drift.
-- **mcplocal's own identity** — recommend minting a dedicated `ServiceAccount:mcplocal-http` subject in mcpd with a non-expiring session token and putting it in `MCPLOCAL_MCPD_TOKEN`. The current session-minting path expires after 30d.
+- **Pulumi (`../kubernetes-deployment`, stack `homelab`)** — add a `Deployment` named `mcplocal` in ns `mcpctl` pointing at `10.0.0.194:3012/michal/mcplocal:latest` (internal registry), a `Service` named `mcp` (port 3200→80, ClusterIP), an `Ingress` for `mcp.ad.itaz.eu` with TLS via the existing cluster-issuer, a PVC `mcplocal-cache` (10Gi RWO, mounted `/var/lib/mcplocal/cache`), and a NetworkPolicy mirroring mcpd's. Required env: **just `MCPLOCAL_MCPD_URL`** (point at `http://mcpd.mcpctl.svc.cluster.local:3100`). Optionally `MCPLOCAL_TOKEN_POSITIVE_TTL_MS` / `MCPLOCAL_TOKEN_NEGATIVE_TTL_MS` for stricter revocation. `fulldeploy.sh` already runs `pulumi preview` first and halts on drift.
+- **No pod-level secret required** (revised from earlier draft) — the pod has no persistent identity to mcpd. Every inbound `Authorization: Bearer mcpctl_pat_…` is forwarded verbatim to mcpd, and mcpd's auth middleware resolves the McpToken principal. This eliminates the original `MCPLOCAL_MCPD_TOKEN` secret and its rotation story. Trade-off: a token with `--rbac=empty` can't read `/api/v1/projects/:name/servers`, but it also can't meaningfully serve MCP, so this is the right failure mode. See `src/mcplocal/src/serve.ts` header comment.
+- **LLM provider config** — if any project served by this pod is `gated: true`, mount your `~/.mcpctl/config.json` as a ConfigMap at `/root/.mcpctl/config.json`. Ungated projects (proxyModel `content-pipeline` or no LLM-driven stages) need nothing.
 
 ### Test stats
 

src/mcplocal/src/serve.ts

@@ -9,6 +9,14 @@
  *   - Requires MCPLOCAL_MCPD_URL to point at mcpd inside the cluster.
  *   - Registers a token-auth preHandler on `/projects/*` and `/mcp`.
  *   - FileCache directory honours MCPLOCAL_CACHE_DIR (wired via project-mcp-endpoint).
+ *
+ * Identity model: **the pod has no persistent identity to mcpd.** Every
+ * inbound request's `Authorization: Bearer mcpctl_pat_…` is forwarded
+ * verbatim for all downstream mcpd calls (introspect + project
+ * discovery). mcpd's auth middleware dispatches on the `mcpctl_pat_`
+ * prefix and resolves the McpToken principal. As a result there is
+ * deliberately no MCPLOCAL_MCPD_TOKEN env var — adding one would only
+ * create a rotation problem for a state we don't need.
  */
 import { McpRouter } from './router.js';
 import { createHttpServer } from './http/server.js';