Adds auto-import feature to complement bd-35's auto-export, completing
the automatic sync workflow for git collaboration.
**Implementation:**
- Auto-import checks if JSONL is newer than DB on command startup
- Silently imports JSONL when modification time is newer
- Skips import command itself to avoid recursion
- Can be disabled with --no-auto-import flag
**Documentation updates:**
- Updated README.md git workflow section
- Updated CLAUDE.md workflow and pro tips
- Updated bd quickstart with auto-sync section
- Updated git hooks README to clarify they're now optional
**Testing:**
- Tested auto-import by touching JSONL and running commands
- Tested auto-export with create/close operations
- Complete workflow verified working
Closes bd-33
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Co-Authored-By: Claude <noreply@anthropic.com>
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