feat(config): dynamic configuration reload during batch execution (#402)

## Summary
- ConfigFileWatcher polling daemon thread monitors CODEFRAME.md/AGENTS.md/CLAUDE.md
- ConfigReloadState provides thread-safe last-known-good config with error fallback
- Conductor integration: watcher started/stopped in serial and parallel execution loops
- Batch status shows reload timestamps
- CONFIG_RELOADED/CONFIG_RELOAD_FAILED event types

## Validation
- Review feedback: All 4 items addressed (OSError race, unbounded list, cached workspace, import placement)
- Demo: All acceptance criteria verified (live watcher test + integration tests)
- Tests: 18 new tests, full suite green
- CI: All checks pass
- Linting: Clean

Closes #402

Author: frankbria

codeframe/cli/app.py

@@ -3796,6 +3796,19 @@ def batch_status(
 
                 console.print(f"    {icon} {tid[:8]} - {title}")
 
+            # Show config reloads if any occurred during batch
+            config_reloads = batch.results.get("__config_reloads__")
+            if config_reloads:
+                from datetime import datetime as _dt
+
+                console.print("\n  [bold]Config Reloads:[/bold]")
+                for ts in config_reloads:
+                    try:
+                        dt = _dt.fromisoformat(ts)
+                        console.print(f"    Config reloaded at {dt.strftime('%H:%M:%S')}")
+                    except (ValueError, TypeError):
+                        console.print(f"    Config reloaded at {ts}")
+
         else:
             # List recent batches
             batches = conductor.list_batches(workspace, limit=10)