[jdkent]

Drops the contract labels C2 and C3 from the paper-parse schema. The artifacts are now called by name: the parsed paper (ParsedPaper) and the coordinate parse (CoordinateParse).

• README: the "Contract" column is removed from the paper-parse table; Analysis.source_table_analysis now names a CoordinateParse key.
• Descriptions in neuroimaging-paper-parse.yaml, paper.yaml, coordinates.yaml and parse_enums.yaml reworded, meaning kept.
• models/paper_parse.py regenerated. Only two enum docstrings change; no field, enum value or type changes, and the JSON Schemas are unchanged.

python tools/generate_models.py --check passes. Suite: 237 passed, 1 skipped.

Cross-repo references (read-only, not changed here):

• ns-pond-ingestion-workflow: none (only matches are inside HTML/gz test fixtures).
• pondie: docs/extraction-workflow-experiments.md lines 197, 198, 204, 208, 212, 271, 387, 391, 597, 615 use C2/C3/C4 as experiment-arm names (critic, targeted re-ask), not contract labels.
• neurostore: store/review-frontend/src/inspector/Inspector.test.tsx:184 ends a test title with "(C2)"; likely a roadmap code, not this contract.

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