fix(opencode): replace probe quota with exact changed-path evidence

[seonghobae]

Root cause

Fresh central-owner audit found a remaining OpenCode model-evidence admission heuristic in both ci-review-prompt.md and scripts/ci/opencode_review_prompt_template.md: formal approval required two falsified probes for source/workflow/config/package/test changes and one for non-code changes. The rule allocates review effort from file/change-type names and fixed integers, with no cited statistical model, experiment, standard, or provider contract establishing those counts.

RED-first repair

Commit 3be4b597d61a5879a94e7aaec7c92af0248886a0 adds tests/test_opencode_no_heuristic_review_evidence.py, requiring the two-versus-one rule to disappear and formal review evidence to use the exact current-head changed-path set as its deterministic evidence universe. Incomplete exact evidence must fail closed with NEEDS_INFO, never degrade to an informal smaller quota.

Commit e8880d8f107f57268d8a3ba53317565368eef20e adds an exact-head, self-retiring source-fix workflow. It replaces the count/name-based admission text in both central prompts, updates docs/product-technical-gap-baseline.md and CHANGELOG.md, runs focused review-policy tests plus the repository test suite, and publishes only if the writer head is unchanged.

Stack / ownership

This PR is stacked on .github#1629 because #1629 is the canonical central review-admission/routing owner and is still carrying its own no-heuristic compute repairs. This child remains Draft until the parent delta is integrated and exact-head checks are terminal GREEN. No force push, destructive rebase, self-approval, or gate bypass is used.

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