[ITSGJY]

Scope

Internal yyjeqhc#962 P0 validation authority refactor:

• Keep the resolved project recipe step as the single Runner execution plan for project_validate.
• Separate result/evidence interpretation through ValidationEvidenceProfile, retaining canonical specialist command builders.
• Verify backend/action/profile identity before starting a project validation Job.
• Parse structured test counts only through matching evidence profiles; retain established Cargo, Go, and pytest behavior.
• Add regression coverage for canonical steps, identities, count evidence, incompatible profiles, and Job admission.

Verification

• cargo test -p webcodex-validation --lib --offline: 115 passed.
• cargo fmt --all -- --check: passed.
• git diff --check: passed.
• Full fork CI 37787599737: SUCCESS on 6f6dd077cda7d0b84e44ab3c77bd7dc5c6e8e7a4.
• Codex final committed-diff review: PASS.
• agy final committed-diff review: PASS.

This fork PR validates the upstream yyjeqhc#962 P0 slice. Upstream submission follows review approval.

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