- Run go fmt on all Go files (10 files formatted)
- Fix 50+ errcheck issues by adding proper error handling
- Fix 3 staticcheck issues (empty branches, error string capitalization)
- Remove 2 unused struct fields
- Install and configure golangci-lint v2.1.6 for Go 1.24 compatibility
- All linting now passes with 0 issues
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-authored-by: Claude <noreply@anthropic.com>
* fix: optimize Go server CPU usage from 500%+ to efficient levels
Major performance improvements to resolve excessive CPU consumption:
**Critical Fixes:**
- Remove WebSocket busy loop that caused continuous CPU spinning
- Fix microsecond-level polling (100μs → 10ms) reducing 100x operations
- Replace ps subprocess calls with efficient kill(pid,0) syscalls
- Increase timer intervals (1s → 30s) for session status checks
**Optimizations:**
- Control FIFO polling: 100ms → 1s intervals
- Select timeout: 100ms → 1s to reduce unnecessary wakeups
- Smart status caching: skip checks for already-exited sessions
- Remove unused imports (os/exec, strconv)
**Impact:**
- Eliminates tight loops causing 10,000+ operations per second
- Reduces subprocess overhead from frequent ps command executions
- Changes from polling-based to efficient event-driven architecture
- Expected CPU usage reduction from 500%+ to levels comparable with Node.js version
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
* fix: prevent WebSocket channel close panic with sync.Once
- Add sync.Once to prevent double-closing of done channel
- Update handleTextMessage signature to accept close function
- Use closeOnceFunc for safe channel closure across goroutines
Fixes panic: 'close of closed channel' in WebSocket handler
* feat: add --do-not-allow-column-set flag to disable resizing for spawned sessions
**New Flag:**
- `--do-not-allow-column-set` (default: true) - Disables terminal resizing for spawned shells
- Only affects sessions created with `spawn_terminal=true`
- Detached sessions (command-line, API without spawn) always allow resizing
**Implementation:**
- Add `IsSpawned` field to session.Config and session.Info structs
- Track whether session was spawned in terminal vs detached
- Server checks flag + spawn status before allowing resize operations
- Returns descriptive error for blocked resize attempts
**Behavior:**
- Spawned sessions: Resize blocked when flag enabled (default)
- Detached sessions: Always allow resizing regardless of flag
- Existing sessions preserve their resize capabilities
**API Response for blocked resize:**
```json
{
"success": false,
"message": "Resizing is disabled for spawned sessions",
"error": "resize_disabled_for_spawned_sessions"
}
```
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
* feat: extend --do-not-allow-column-set flag to block ALL session resizing
**Breaking Change:** Flag now affects both spawned AND detached sessions
**Changes:**
- Remove `sess.IsSpawned()` check in resize handler
- Block resizing for ALL sessions when flag is enabled (default: true)
- Update flag description: "Disable terminal resizing for all sessions (spawned and detached)"
- Update error message: "Terminal resizing is disabled by server configuration"
- Update error code: "resize_disabled_by_server"
**New Behavior:**
- `--do-not-allow-column-set=true` (default): NO resizing for any session type
- `--do-not-allow-column-set=false`: Allow resizing for all session types
- Applies uniformly to both spawned terminal windows and detached CLI sessions
**API Response for blocked resize:**
```json
{
"success": false,
"message": "Terminal resizing is disabled by server configuration",
"error": "resize_disabled_by_server"
}
```
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
---------
Co-authored-by: Claude <noreply@anthropic.com>
* feat: add terminal max width option
- Add terminal preferences manager for persistent settings storage
- Add maxCols property to terminal component with width constraint logic
- Add UI toggle button (∞/80) in session header for easy width control
- Default behavior unchanged: unlimited width (takes full container)
- Optional 80-column max width limit when enabled
- Preferences saved to localStorage and restored on page load
- Real-time updates without page refresh
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
* feat: enhance terminal width selector with common presets and custom input
- Add common terminal width presets: ∞, 80, 100, 120, 132, 160
- Add custom width input field (20-500 columns)
- Replace simple toggle with dropdown selector UI
- Include helpful descriptions for each preset
- Support keyboard shortcuts (Enter to submit, Escape to cancel)
- Add click-outside-to-close functionality
- Maintain all existing preferences persistence
- Show current width in button label and tooltip
Common widths:
- 80: Classic terminal
- 100: Modern standard
- 120: Wide terminal
- 132: Mainframe width
- 160: Ultra-wide
- Custom: User-defined (20-500)
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
* fix: prevent WebSocket send on closed channel panic
Added safeSend helper function with panic recovery to handle race conditions
when multiple goroutines access WebSocket channels. Replaces unsafe channel
sends with graceful error handling.
🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
---------
Co-authored-by: Claude <noreply@anthropic.com>
