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## Code Review - Ticket #95: Part 3 - Debug Dashboard

### Summary
PASS - All acceptance criteria met. Complete debug dashboard with agent status cards, xterm.js live terminal, session history browser, ActionCable live updates, and responsive mobile design.

### Files Changed
- 18 files (+848/-3 lines)
- 3 new Stimulus controllers (terminal, agent_status, collapse)
- 3 new dashboard views (debug, terminal, sessions)
- 3 new partials (_agent_card, _agent_cards, _agent_stats)
- Dashboard controller enhanced with debug/sessions/terminal/refresh actions
- Helper methods for status colors and duration formatting
- New routes for debug dashboard

### Acceptance Criteria Verification

#### 1. Agent Status Cards ✓
**`_agent_card.html.haml` (72 lines):**
- Agent icon with first letter of agent_type
- Name, agent_type, status indicator (idle/busy with colors)
- Current ticket display with link (if assigned)
- Stats row: sessions count, tickets count, last activity (time_ago_in_words)
- Footer actions: Terminal button, History button
- Visual status: green/idle, yellow/busy with animate-pulse

**`_agent_stats.html.haml` (41 lines):**
- Quick stats: total agents, active agents, busy agents, idle agents
- Tickets in progress, completed today, pending approvals
- Active sessions count

#### 2. Live Terminal View with xterm.js ✓
**`terminal.html.haml` (81 lines):**
- Loads xterm.js CSS and JS from CDN (v5.3.0)
- Loads xterm-addon-fit for responsive terminal
- Terminal container with macOS-style window buttons (red/yellow/green)
- Agent name and session info in header
- Pause/Resume button with icon toggle
- Session info panel (collapsible): ID, status, started, duration

**`terminal_controller.js` (151 lines):**
- Initializes xterm.js with custom theme (dark background)
- FitAddon for responsive sizing
- ActionCable subscription to TerminalChannel with agent_id
- `handleTerminalData()`: writes incoming lines with `\\r\\n`
- `loadHistory()`: fetches session logs from API
- `togglePause()`: buffers data when paused, flushes on resume
- Auto-fit on window resize

#### 3. Session History Browser ✓
**`sessions.html.haml` (105 lines):**
- Filter form: agent dropdown, status dropdown, date range (from/to)
- Sessions table: ID, agent, status badge, started, duration, log count
- Actions: View Terminal, Details
- Pagination with Previous/Next buttons
- Responsive grid for filters

**Dashboard Controller `sessions` action:**
- Filters by agent_id, ticket_id, status, date range
- Pagination with offset/limit (20 per page)
- Includes agent and terminal_logs for eager loading

#### 4. ActionCable for Live Updates ✓
**`agent_status_controller.js` (108 lines):**
- Subscribes to AgentChannel for all agents
- 5-second polling fallback for status updates
- `handleAgentUpdate()`: updates status indicator and last activity
- `updateStatus()`: toggles green/yellow classes
- `updateLastActivity()`: formats time ago

**`refresh.turbo_stream` (partial):**
- Turbo Stream response for live updates
- 30-second auto-refresh via JavaScript in debug.html.haml

#### 5. Responsive Mobile Design ✓
- Tailwind responsive classes throughout (`md:flex-row`, `md:grid-cols-4`)
- Terminal container uses 100% width with fit addon
- Session table responsive with whitespace-nowrap
- Filters stack vertically on mobile, grid on desktop
- Agent cards flex layout adapts to screen size

### Additional Quality Observations

**Helper Methods:**
- `agent_status_bg_color()`: Returns Tailwind color class based on agent status
- `agent_status_text_color()`: Text color matching status
- `session_status_badge()`: Badge styling for running/completed/failed
- `format_duration()`: Formats seconds as "1h 30m 45s"

**Avo Resources:**
- Added `agent_session.rb` and `agent_terminal_log.rb` resources
- Enables admin viewing of sessions and logs

**Security:**
- Terminal view uses `data: { turbo: false }` to prevent Turbo interference with xterm.js
- Session info uses `agent_id` param to fetch specific agent

### Code Quality
- Clean separation of concerns (3 focused controllers)
- Proper ActionCable subscription cleanup in disconnect()
- CDN-loaded xterm.js with retry mechanism
- Fallback polling when WebSocket unavailable
- Responsive design with Tailwind utilities

### Minor Notes
- **Dependency**: Requires PR #94 migrations (AgentSession, AgentTerminalLog models)
- **CDN Usage**: xterm.js loaded from jsdelivr (consider bundling for production)
- **Polling**: 5-second polling fallback (could be optimized)

### No Issues Found
No bugs, security issues, or code quality problems identified. The implementation provides a comprehensive debug dashboard for real-time agent monitoring.

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