/done

Close increment with PM validation - checks tasks, tests, and docs before closing

# Close Increment (PM Validated)

**Product Manager-Led Closure**: PM validates tasks, tests, and docs before closing.

You are acting as the Product Manager to validate increment completion before closure. You must check all 3 gates: tasks done, tests passing, and docs updated.

**NEW (v0.8.0+)**: Automatic GitHub issue reopening when validation fails. If PM gates fail and a GitHub issue exists for this increment, the system automatically reopens the issue with validation failure details. This ensures issues aren't prematurely closed when work is incomplete.

**NEW (v0.28.63+)**: **EXPLICI...