Changes

Claude → Claude Code rename

All user-facing references to bare "Claude" updated to "Claude Code" across source, tests, and documentation. Engine IDs ("claude") and model/subscription references remain unchanged.

Affected areas:

• Runner error messages (claude.py)
• Runner bridge notification text (runner_bridge.py)
• Control channel button labels (claude_control.py)
• Config command descriptions and display names (config.py)
• Usage command error messages (usage.py)
• 27 documentation files (tutorials, how-to, reference)
• 7 test files (assertion strings, docstrings)

Error hint improvements

• Signal hints (SIGTERM/SIGKILL/SIGABRT) no longer hardcode /claude — now engine-agnostic
• Added "finished without a result event" hint (covers all 6 engines)
• Added "finished but no session_id" hint (covers all 6 engines)
• Usage command: descriptive HTTP error messages for 429/500/502/503/504
• Usage command: specific handlers for ConnectError and TimeoutException
• Config reasoning page: fixed .capitalize() producing bare "Claude" instead of "Claude Code"