fix: handle pausing/draining states in UI guards and process cleanup

Follow-up fixes after merging PR #183 (graceful pause/drain mode):

- process_manager: _stream_output finally block now transitions from
  pausing/paused_graceful to crashed/stopped (not just running), and
  cleans up the drain signal file on process exit
- App.tsx: block Reset button and R shortcut during pausing/paused_graceful
- AgentThought/ProgressDashboard: keep thought bubble visible while pausing
- OrchestratorAvatar: add draining/paused cases to animation, glow, and
  description switch statements
- AgentMissionControl: show Draining/Paused badge text for new states
- registry.py: remove redundant type annotation to fix mypy no-redef
- process_manager.py: add type:ignore for SQLAlchemy Column assignment
- websocket.py: reclassify test-pass lines as 'testing' not 'success'
- review-pr.md: add post-review recommended action guidance

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

ui/src/App.tsx

@@ -210,8 +210,8 @@ function App() {
         setShowKeyboardHelp(true)
       }
 
-      // R : Open reset modal (when project selected and agent not running)
-      if ((e.key === 'r' || e.key === 'R') && selectedProject && wsState.agentStatus !== 'running') {
+      // R : Open reset modal (when project selected and agent not running/draining)
+      if ((e.key === 'r' || e.key === 'R') && selectedProject && !['running', 'pausing', 'paused_graceful'].includes(wsState.agentStatus)) {
         e.preventDefault()
         setShowResetModal(true)
       }
@@ -380,7 +380,7 @@ function App() {
                       variant="outline"
                       size="sm"
                       aria-label="Reset Project"
-                      disabled={wsState.agentStatus === 'running'}
+                      disabled={['running', 'pausing', 'paused_graceful'].includes(wsState.agentStatus)}
                     >
                       <RotateCcw size={18} />
                     </Button>