feat: advance conformance and deterministic ID migration

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a023c0-a0a3-7c03-b395-5a0d2757214d

tests/test_identifiers.py

@@ -4,7 +4,11 @@ from pathlib import Path
 
 import pytest
 
-from repo_manager.identifiers import derive_work_record_uuid, scan_live_identifier_collisions
+from repo_manager.identifiers import (
+    derive_work_record_uuid,
+    plan_identifier_migration,
+    scan_live_identifier_collisions,
+)
 
 
 def _workplan(path: Path, identifier: str, status: str, task_status: str = "todo") -> None:
@@ -48,3 +52,48 @@ def test_preflight_blocks_live_collision_but_ignores_archived_history(tmp_path:
     _workplan(two / "workplans" / "two.md", "SHARED-WP-0001", "archived")
     report = scan_live_identifier_collisions(tmp_path)
     assert report["ok"] is True
+
+
+def test_migration_plan_preserves_mapping_and_is_atomic_per_repo(tmp_path: Path) -> None:
+    one = tmp_path / "one"
+    two = tmp_path / "two"
+    _workplan(one / "workplans" / "one.md", "ONE-WP-0001", "active")
+    _workplan(two / "workplans" / "two.md", "TWO-WP-0001", "ready", task_status="done")
+
+    report = plan_identifier_migration(tmp_path, "fleet-a")
+
+    assert report["ok"] is True
+    assert report["apply_policy"] == "all-or-nothing per repository"
+    assert report["totals"] == {
+        "repositories": 2,
+        "eligible": 2,
+        "skipped": 0,
+        "records": 3,
+        "replace": 0,
+        "assign": 3,
+        "unchanged": 0,
+    }
+    one_plan = next(item for item in report["repositories"] if item["repo"] == "one")
+    assert one_plan["atomic_unit"] is True
+    assert {item["record_id"] for item in one_plan["mappings"]} == {
+        "ONE-WP-0001",
+        "ONE-WP-0001-T01",
+    }
+    assert all(item["current_uuid"] is None for item in one_plan["mappings"])
+
+
+def test_migration_plan_skips_entire_repo_affected_by_collision(tmp_path: Path) -> None:
+    one = tmp_path / "one"
+    two = tmp_path / "two"
+    _workplan(one / "workplans" / "one.md", "SHARED-WP-0001", "active")
+    _workplan(one / "workplans" / "safe.md", "ONE-WP-0002", "active")
+    _workplan(two / "workplans" / "two.md", "SHARED-WP-0001", "ready")
+
+    report = plan_identifier_migration(tmp_path, "fleet-a")
+
+    assert report["ok"] is False
+    assert report["totals"]["skipped"] == 2
+    one_plan = next(item for item in report["repositories"] if item["repo"] == "one")
+    assert one_plan["eligible"] is False
+    assert any(item["record_id"] == "ONE-WP-0002" for item in one_plan["mappings"])
+    assert any(item["reason"] == "live identifier collision" for item in one_plan["blockers"])