Add configurable Claude profile discovery

[cainrus]

Summary

• add aiEngineerCoach.claudeConfigDirs for explicit Claude config root selection
• keep automatic discovery via CLAUDE_CONFIG_DIR and ~/.claude when unset
• deduplicate Claude config roots via realpath and sessions by sessionId
• allow Claude-only parsing when no VS Code/Xcode log dirs exist

Validation

• npm run typecheck
• npx vitest run src/core/parser-claude.test.ts src/core/parser-harnesses.test.ts
• npm run lint