Separate continuity lifecycle states

[samrusani]

Summary

• add separate preservation, searchability, and promotability lifecycle state for continuity objects
• make continuity recall and resumption respect searchable and promotable state by default
• add lifecycle inspection endpoints and CLI support, plus coverage for the new behavior

Testing

• python3 -m pytest tests/unit/test_continuity_objects.py tests/unit/test_continuity_capture.py tests/unit/test_continuity_recall.py tests/unit/test_continuity_resumption.py tests/unit/test_continuity_review.py tests/unit/test_continuity_open_loops.py tests/unit/test_cli.py tests/unit/test_main.py tests/unit/test_20260410_0049_continuity_object_lifecycle_flags.py tests/integration/test_continuity_recall_api.py tests/integration/test_continuity_resumption_api.py tests/integration/test_cli_integration.py -q