[codex] Add screenplay draft governance and format checks

[XucroYuri]

Summary

• add machine-checked golden artifact format contracts, including screenplay block validation for scene_draft and the new screenplay_draft
• wire screenplay_draft through routing, scene-writing protocols, rubrics, fixtures, and runtime expression-lens metadata
• add failure archive cases for missing performance carriers, AV cue omission, and cross-artifact naturalness drift

Validation

• python3 -m unittest discover -s tests -v

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Skip contract indexing when schema validation fails

If references/output-format-contracts.json is malformed (for example, a contract entry is missing output), this function already records schema errors but then immediately builds contract_by_output with contract["output"], which raises KeyError and aborts the check. In that scenario the script crashes instead of returning the collected validation report, so CI/users lose actionable diagnostics on the actual schema violation.

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