Remove chat rooms and agent loops before storage migration (#3053)

* refactor(storage): remove chat rooms and agent loops

This is the prerequisite cleanup for the storage backend migration. Legacy wire schemas remain temporarily so mixed-version peers can still parse old messages, while daemon callers now use query-shaped AgentStorage methods that can map directly to SQL later.

* test(cli): remove retired chat and loop coverage

docs/architecture.md

@@ -76,8 +76,6 @@ not retain non-Git directories.
 | `server/agent/providers/`       | Provider adapters (see "Agent providers" below)                               |
 | `server/relay-transport.ts`     | Outbound relay connection with E2E encryption                                 |
 | `server/schedule/`              | Cron-based scheduled agents                                                   |
-| `server/loop-service.ts`        | Looping agent runs that retry until an exit condition                         |
-| `server/chat/`                  | Chat rooms for agent-to-agent and human-to-agent messaging                    |
 
 ### `packages/protocol` — Wire schemas and shared protocol types
 
@@ -119,10 +117,8 @@ Commander.js CLI with Docker-style commands. Common agent operations are also ex
 
 - `paseo agent ls/run/import/attach/logs/stop/delete/send/inspect/wait/archive/reload/update/mode`
 - `paseo daemon start/stop/restart/status/pair/set-password`
-- `paseo chat ls/create/inspect/post/read/wait/delete`
 - `paseo terminal ls/create/capture/send-keys/kill`
 - `paseo script ls/start/stop`
-- `paseo loop run/ls/inspect/logs/stop`
 - `paseo schedule create/ls/inspect/update/pause/resume/run-once/logs/delete`
 - `paseo heartbeat create/update/delete`
 - `paseo workspace create/ls/archive`
@@ -384,9 +380,7 @@ $PASEO_HOME/
 ├── projects/projects.json                      # Project registry
 ├── projects/workspaces.json                    # Workspace registry
 ├── projects/icons/                             # Custom project icon images
-├── chat/                                       # Chat rooms
 ├── schedules/                                  # Scheduled-agent definitions and runs
-├── loops/                                      # Loop runs and logs
 ├── config.json                                 # Daemon config (mutable)
 ├── daemon-keypair.json                         # Daemon identity for relay/E2EE
 ├── push-tokens.json                            # Mobile push tokens