fix: resolve all 5 startup constructor errors + add DB retry

Fixes all errors reported in docker compose logs agent-service:

1. config.py: add ollama_max_concurrent, claude_timeout, claude_max_concurrent
   fields so LLMRouter(config=settings) can read them without AttributeError.

2. main.py - LLM router: drop manual OllamaBackend/ClaudeBackend construction;
   call LLMRouter(config=settings, pg_pool=pool) to match class signature.
   Fixes: OllamaBackend.__init__() unexpected kwarg 'base_url'.

3. main.py - DB: add 5-attempt retry with 2s backoff and redacted DSN logging.
   Fixes: connection refused race on startup before Postgres accepts connections.

4. main.py - AgentRegistry: call AgentRegistry() with no args (class takes none),
   then await agent_registry.load_from_odoo(odoo) to populate active agents.
   Fixes: AgentRegistry.__init__() unexpected kwarg 'odoo'.

5. main.py - PeerBus: pass registry=agent_registry at construction; register
   specialist agents on agent_registry (not peer_bus, which has no register()).
   peer_bus.py: make directive_id optional (default None) — bus is a singleton
   at startup; directive_id is only needed per-request.
   Fixes: PeerBus.__init__() missing positional args 'registry' and 'directive_id'.

6. main.py - MasterAgent: drop unexpected peer_bus= kwarg from constructor call.
   Fixes: MasterAgent.__init__() unexpected kwarg 'peer_bus'.

7. mcp_router.py: pass NotificationOptions() instance instead of None.
   Fixes: AttributeError 'NoneType' has no attribute 'tools_changed' (was applied
   in running container but not committed; now committed).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

agent_service/routers/mcp_router.py

@@ -10,6 +10,7 @@ from __future__ import annotations
 import logging
 
 from mcp.server.models import InitializationOptions
+from mcp.server.lowlevel import NotificationOptions
 from starlette.requests import Request
 from starlette.responses import Response
 from starlette.routing import Route
@@ -26,7 +27,7 @@ _INIT_OPTIONS = InitializationOptions(
     server_name='activeblue-ai',
     server_version='0.1.0',
     capabilities=_mcp_server.get_capabilities(
-        notification_options=None,
+        notification_options=NotificationOptions(),
         experimental_capabilities={},
     ),
 )