fix(heldout): declare score-reliability sample size

[seonghobae]

Stack

Draft successor of #1099 (b975c3dd). Parents #1098, #1097, #1096, #1095, #1093, #1092, #1091, #1090, #1074, and psychometric KPI owner #1067 stay open. This PR does not close #1099.

Exact head: 9ff12b5dfbf2a36f21f0e16cc311eb3949b90e94.

Problem

Held-out posterior reliability evidence hid RELIABILITY_SAMPLE_SIZE = 1_200, so weak- versus strong-information cases used a repository-selected person population.

Change

• Require declared sample_size on _validate_score_reliability. Missing, boolean, or non-positive values fail closed.
• The harness run still writes 1,200 as this run's choice and records sample_size_per_case.
• ADR 0051 is Proposed. Production route/conduct defaults stay locked.

Verification

Local smallest tests:

• 64 passed in 16.19s (tests/test_psychometric_routing.py, tests/test_psychometric_benchmark_boundaries.py, tests/test_planning_adr_identifiers.py)
• interrogate on the held-out script: 100%

This is declaration-contract evidence, not buyer-held-out accuracy, p95 latency, or protected merge.

Remaining no-heuristics work

Other harness sample sizes (judge, exploration rate) remain later slices. No production policy or release is authorized. Parent #1067 still needs independent review.

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[seonghobae]

Normal predecessor integration at 3e85d32 retains original reliability sample declaration 9ff12b5 and includes predecessor da4ceac. No-detection censoring, alarm/detection denominators, null ineligible calibration candidate and retained calibration results now propagate through this stack. Merged-tree validation: 31 boundary/ADR identifier tests passed in 12.92 seconds; Ruff and diff whitespace checks passed; CodeGraph indexing completed. No force push or discarded delta. This is local regression evidence, not real-data accuracy, protected merge or release evidence. Required checks and reviews must use the new head.