Old bd versions (<0.24.0) installed merge driver with invalid %L/%R
placeholders. Git only supports %O (base), %A (current), %B (other).
Changes:
- mergeDriverInstalled() now detects %L/%R and returns false to trigger repair
- bd init automatically fixes stale configs during initialization
- bd doctor --fix also repairs stale configs
- Added comprehensive test coverage for auto-repair
Fixes: bd-3sz0
Epic: bd-tbz3 (all sub-issues now complete)
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Co-Authored-By: Claude <noreply@anthropic.com>
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