Five modes: client (orange), dev (cyan), infra (red), general (blue),
remediation (purple). Auto-detects from user messages using keyword
priority rules. Manual override via /mode <name>. Color changes via
/color on mode transitions. Posture adjusts per mode (e.g., infra =
confirm-before-destructive, dev = delegate freely).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>