feat(deploy): platform handoff — agent routing, persistence, docs cleanup

Agent routing:
- Remove !agent command and manual agent selection flow
- Registry auto-assigns agent from user_agents mapping (fallback: agents[0])
- provision_workspace_chat and !new both write agent_id to room_meta
- Reconciliation backfills agent_id from registry on cold start
- Fix duplicate agent_id block in auth.py

Deployment stability:
- Add bot-state named volume to persist lambda_matrix.db and matrix_store
- Fix docker-compose.prod.yml duplicate environment: key (was silently losing all Matrix credentials)
- Fix MATRIX_AGENT_REGISTRY_PATH to use absolute container path /app/config/...
- Add bot-state volume declaration to docker-compose.fullstack.yml

Docs and config:
- Rewrite README.md for platform handoff (deploy table, working commands only)
- Rewrite docs/matrix-prototype.md (remove stale commands and mock descriptions)
- Remove !save/!load/!context/!agent from help text and welcome message
- Add !clear, !list, !remove, !yes/!no to help text
- Clean up .env.example (remove Telegram token, internal vars, real URLs)
- Update config/matrix-agents.example.yaml with user_agents section and comments
- Add explanatory comment to Dockerfile for --ignore-requires-python
- Remove silent uv sync fallbacks in Dockerfile

adapter/matrix/handlers/auth.py

@@ -6,6 +6,7 @@ import structlog
 from nio.api import RoomVisibility
 from nio.responses import RoomCreateError
 
+from adapter.matrix.agent_registry import AgentRegistry
 from adapter.matrix.store import (
     get_user_meta,
     next_platform_chat_id,
@@ -30,6 +31,7 @@ async def provision_workspace_chat(
     auth_mgr,
     chat_mgr,
     room_name_override: str | None = None,
+    registry: AgentRegistry | None = None,
 ) -> dict:
     user = await platform.get_or_create_user(
         external_id=matrix_user_id,
@@ -64,6 +66,13 @@ async def provision_workspace_chat(
     chat_id = f"C{next_chat_index}"
     platform_chat_id = await next_platform_chat_id(store)
     room_name = room_name_override or _default_room_name(chat_id)
+
+    agent_id = None
+    if registry is not None:
+        agent_id = registry.get_agent_id_for_user(matrix_user_id)
+        if agent_id is None and registry.agents:
+            agent_id = registry.agents[0].agent_id
+
     chat_resp = await client.room_create(
         name=room_name,
         visibility=RoomVisibility.private,
@@ -100,6 +109,7 @@ async def provision_workspace_chat(
             "matrix_user_id": matrix_user_id,
             "space_id": space_id,
             "platform_chat_id": platform_chat_id,
+            "agent_id": agent_id,
         },
     )
     await chat_mgr.get_or_create(
@@ -127,6 +137,7 @@ async def handle_invite(
     store,
     auth_mgr,
     chat_mgr,
+    registry: AgentRegistry | None = None,
 ) -> None:
     matrix_user_id = getattr(event, "sender", "")
     display_name = getattr(room, "display_name", None) or matrix_user_id
@@ -147,6 +158,7 @@ async def handle_invite(
             auth_mgr,
             chat_mgr,
             room_name_override="Чат 1",
+            registry=registry,
         )
     except RuntimeError as exc:
         logger.error("invite_workspace_provision_failed", user=matrix_user_id, error=str(exc))
@@ -154,7 +166,7 @@ async def handle_invite(
 
     welcome = (
         f"Привет, {created['user'].display_name or matrix_user_id}! Пиши — я здесь.\n\n"
-        "Команды: !new · !chats · !rename · !archive · !context · !save · !load · !help"
+        "Команды: !new · !chats · !rename · !archive · !clear · !help"
     )
     await client.room_send(
         created["chat_room_id"],