feat: Add Claude Code support

[jamro]

Area

Integration (Cursor / Antigravity / REST)

Problem

Tiny Software Engineer currently does not support Claude Code, limiting the robot integration to existing coding agents.

Proposed change

Add a Claude Code integration that maps its activity (reading, writing, thinking, completion) to the existing robot behaviors. Keep agent-specific handling separate from robot behavior logic to make future integrations easier.

[jtruland]

Opened #34 with a Claude Code hook integration (mirrors the Cursor/Antigravity pattern — .claude/hooks/pose.sh + settings.json event mapping). Docs updated in docs/integration.md.