[P4] NL → graph parser

[duckyquang]

Phase: P4
Owner(s): Akash

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Goal: Parse word problems into FactorGraph JSON. Post-submission.

Where: marc/parser/, gold data in marc/data/nl_benchmark/gold/.

Parallel track: All P4 tasks independent — start after Jul 28 submission.

1. Hand-label 20 gold graphs; implement parse_word_problem(text) → FactorGraph.

2. Eval script + results/p4_parser/accuracy.md.

3. If >70% accuracy, add --from-text flag to solve_one.py.

Done when: 20 gold examples + accuracy report exist.

Push to: PR akash/p4-parser → main.

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