kazuki 763417731a docs: add project index and PR documentation ...

Add comprehensive project documentation:
- PROJECT_INDEX.json: Machine-readable project structure
- PROJECT_INDEX.md: Human-readable project overview
- PR_DOCUMENTATION.md: Pull request preparation documentation
- PARALLEL_INDEXING_PLAN.md: Parallel indexing implementation plan

Provides structured project knowledge base and contribution guidelines.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-10-20 03:53:29 +09:00

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