Matt Vollmer 8e57498a87 docs: update Chats API and platform controls docs to match current state (#23803)
The Chats API docs and platform controls docs had fallen behind the
implementation. This brings them up to date.

## Chats API docs (`chats-api.md`)

### Breaking: archive/unarchive endpoints removed

The old `POST /{chat}/archive` and `POST /{chat}/unarchive` endpoints no
longer exist. Replaced with the `PATCH /{chat}` update endpoint
(`{"archived": true/false}`).

### Chat object updated

Added all new fields to the example response and a new reference table:
- `build_id`, `agent_id` — workspace agent binding
- `parent_chat_id`, `root_chat_id` — delegated/child chat lineage
- `pin_order` — pinned chats
- `labels` — general-purpose key-value labels
- `mcp_server_ids` — MCP server bindings
- `has_unread` — read/unread tracking
- `diff_status` — PR/diff metadata

### New endpoints documented

- `PATCH /{chat}` — update chat (title, archived, pin_order, labels)
- `PATCH /{chat}/messages/{message}` — edit a user message
- `GET /watch` — watch all chats via WebSocket
- `POST /{chat}/title/regenerate` — regenerate title
- `GET /{chat}/diff` — get diff/PR status
- `DELETE /{chat}/queue/{id}` / `POST /{chat}/queue/{id}/promote` —
queue management

### Updated existing endpoint docs

- Create chat: added `mcp_server_ids` and `labels` fields
- Send message: added `mcp_server_ids` field
- List chats: added `q` and `label` query parameters
- Stream: noted read cursor behavior on connect/disconnect

## Platform controls docs

### Template allowlist (`platform-controls/index.md`)

- Updated the "Template routing" section to document the template
allowlist setting (**Agents** > **Settings** > **Templates**)
- Removed the "Template scoping for agents" bullet from "Where we are
headed" since it shipped

### Template optimization (`template-optimization.md`)

- Added "Restrict available templates" section documenting the allowlist
UI, behavior, and scope (agents only, not manual workspace creation)

---

*PR generated with Coder Agents*
2026-03-30 10:28:15 -04:00
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