Implement ORDER 193 Vessel R material handoff

[Junghoo-developer]

Summary

• Adds Node3VesselRMaterial / Node3VesselRMaterialItem so completed Vessel R traversal output can be passed to node_3 as read-only graph memory material.
• Keeps Vessel R material separate from read_doc, read_code_file, document context, and recent-memory context.
• Adds node_3 grounding/runtime visibility plus node_4 guard coverage for failed/partial Vessel R material and raw graph ID leakage.

Information Boundary

• Absolute information changed: schema/status/source fields for Vessel R material copied from DataStore and R read packet records.
• Relative information changed: none generated by code.
• Mixed information changed: pre-existing graph summary text is passed through with its stored info_class; code does not summarize it.

Verification

• python -m compileall songryeon_core main.py tests\test_order_193_r_result_to_node3_vessel_material.py
• python -m pytest tests/test_order_193_r_result_to_node3_vessel_material.py -q
• python main.py smoke-test
• python -m pytest -q --maxfail=1
• git diff --check

Notes

This does not enable default route=R or a full R-powered live answer route. It only lets node_3 safely receive already-recorded Vessel R traversal material.