docs: drop stale chromadb-setup.md; strip broken VM-102 frontmatter

Second pass on docs/ cleanup (item #15 in STATUS.md):

- pfi/chromadb-setup.md: deleted. References configs/pfi-ana/... and
  scripts/setup-chromadb.sh, neither of which exist in this repo
  (artifacts of an earlier project layout). ChromaDB is already live
  per docker-stack.md; the operational truth lives there.
- pfi/docker-stack.md: removed the cross-link to the deleted file and
  pulled the bit of useful content from it (auth-token generation +
  client Settings example) into the inline ChromaDB section.
- pfi/vm-102-matrix-{synapse,appservice}.md: stripped the YAML
  frontmatter. The `path:` values pointed at docs/pfi-ana/... which
  doesn't exist in this repo; no toolchain consumed the metadata.
- README.md: tree updated to reflect the deletion.

VM-102 docs kept separate by design — each is right-sized; merging
would push past the ~500-line guideline.

docs/pfi/docker-stack.md

@@ -272,7 +272,7 @@ Dockge expects compose files under `/opt/docker/compose/` on the Docker host. Th
 
 **Authentication**: Token-based. The auth token is stored at `/opt/docker/conf/chromadb/auth_token` on the host (mode 600), generated with `openssl rand -hex 32`. Clients must supply this token to access the API.
 
-**Notes**: CPU-only service (no GPU). The compose-examples directory contains a reference compose file with Traefik labels and a demo app — see [chromadb-setup.md](chromadb-setup.md) for full deployment instructions and the demo.
+**Notes**: CPU-only service (no GPU). Token is generated once at deploy with `openssl rand -hex 32` into `/opt/docker/conf/chromadb/auth_token` (mode 600); clients pass it via the chromadb client `Settings(chroma_client_auth_provider="...TokenAuthClientProvider", chroma_client_auth_credentials="...")`.
 
 ---
 
@@ -324,10 +324,3 @@ Dockge expects compose files under `/opt/docker/compose/` on the Docker host. Th
 | 8745 | VibeVoice | HTTP |
 | 9292 | llama-swap | HTTP (→ container 8080) |
 
-## Example Configurations
-
-Reference/example compose files (not live) are stored in `configs/pfi-ana/docker/compose-examples/`:
-- `compose-examples/llama-swap/docker-compose.yml` — earlier llama-swap reference
-- `compose-examples/chromadb/` — ChromaDB with Traefik labels, auth, health checks, and demo app
-
-Full ChromaDB setup instructions: [chromadb-setup.md](chromadb-setup.md)