docs(bench): decouple #959 AC from #900 ladder and live GDC runs

[DecisionNerd]

Summary

• Update #959 acceptance criteria on GitHub: closure depends on bounded tiny/shadow parity and measurement-policy outcomes only; no test(scale): complete the S18-S26 lifecycle ladder on OVHC-AGENCY #900 ladder run or live GDC suite execution required.
• Align parity_gate criteria, scale-parity-index.md, and harness README/tests with that decision (prefix_parity_ready = tiny fixtures; full ladder tracked for epic(bench): externalize scale certification and add GDC benchmark suites #952/test(scale): complete the S18-S26 lifecycle ladder on OVHC-AGENCY #900 only).

Test plan

• PYTHONPATH=harness uv run --locked python -m unittest tests.test_parity_gate tests.test_ladder_bundle_ingest

Part of #959.

Made with Cursor

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