chore: add .claude/CLAUDE.md for development guidance

[victoraraujo105]

Summary

Add development guidance file for Claude Code integration.

Contents

• Project overview and architecture
• Key design principles (explicit task setting, session isolation)
• Development and testing instructions
• Hook events documentation
• Code style guidelines
• PR guidelines

Notes

The .claude/ directory is ignored by the plugin loader, so this file is purely for development guidance when Claude Code works on this repo.

Test plan

• File created at .claude/CLAUDE.md
• Verify plugin still loads correctly (directory should be ignored)

[claude]

Code review

No issues found. Checked for bugs and CLAUDE.md compliance.

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Review Summary:

✅ CLAUDE.md Compliance: The new development guide is internally consistent with no contradictions
✅ Directory Structure: Documented structure accurately describes the plugin architecture
✅ Hook Events: All referenced hooks (SessionStart, PreToolUse, PostToolUse, PreCompact, Stop) are valid
✅ Code Style Guidelines: Shell script best practices are clearly documented
✅ Security: No security concerns in this documentation file
✅ Correctness: No bugs or logical errors detected

This CLAUDE.md file will provide helpful development guidance for contributors working on the task-tracker-plugin.