Steve Yegge b065b32a51 Implement collision detection for import (bd-12) ...

Add collision detection infrastructure to identify conflicts during
JSONL import when branches diverge and create issues with the same ID.

New files:
- internal/storage/sqlite/collision.go: Core collision detection logic
  - detectCollisions() categorizes issues as exact matches, collisions, or new
  - compareIssues() identifies which fields differ between issues
  - CollisionDetail provides detailed collision reporting

- internal/storage/sqlite/collision_test.go: Comprehensive test suite
  - Tests exact matches, new issues, and various collision scenarios
  - Tests multi-field conflicts and edge cases
  - All tests passing

This lays the foundation for bd-13 through bd-17 (reference scoring,
ID remapping, CLI flags, and documentation).

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

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

2025-10-12 16:22:44 -07:00

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