Persist canonical parent memory summaries at ingest

[brianmeyer]

Summary

• persist a compact root-memory summary/body for document parents during ingest
• persist a text-summary fallback root embedding for video memories when raw video embedding fails
• harden summary embedding so failures degrade gracefully instead of aborting child indexing

Linked work

• REC-173
• supports REC-172 memory-level summaries by giving parent memories durable root text

Verification

• pytest -q tests/test_storage.py -q
• pytest -q tests/test_search_pipeline.py tests/test_config_tools.py tests/test_json_compliance.py tests/test_cross_modal_pipeline.py -q
• pytest -x -m 'not live' --tb=short

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