feat: real-time tool progress + live logs for DeepResearch agent

- InteractTab shows streaming content word-by-word with tool progress
- LogsTab polls every 5s, shows learning log entries with color-coded badges
- Backend emits tool_progress SSE events during agent execution
- Learning log entries written for query_start, tool_call, tool_result, query_complete
- "Run Now" replaced with "Chat ready" indicator on Interact tab

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/openjarvis/server/agent_manager_routes.py

@@ -595,8 +595,11 @@ async def _stream_managed_agent(
                         f"Query: {user_content[:100]}",
                         {"full_query": user_content},
                     )
-                except Exception:
-                    pass
+                except Exception as _log_exc:
+                    logger.warning(
+                        "Failed to log query_start: %s",
+                        _log_exc,
+                    )
 
                 # Patch the agent's tool executor to emit progress
                 dr_agent = DeepResearchAgent(