Prevents agents from creating duplicate low-numbered issues when starting
with a fresh git clone that already has issues.jsonl in git history.
Changes:
- bd init now checks for existing issues in git after DB creation
- Auto-imports with collision resolution if found
- Updates AGENTS.md to simplify onboarding (just 'bd init')
Fixes the scenario where:
1. Fresh clone has .beads/issues.jsonl in git (212 issues)
2. Agent runs bd init (creates empty DB)
3. Agent starts creating bd-1, bd-2, etc (collisions with git)
Now bd init automatically imports all issues from git on first run.
Amp-Thread-ID: https://ampcode.com/threads/T-8a41f14d-d4c3-4c50-a18b-5f112110f138
Co-authored-by: Amp <amp@ampcode.com>
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