fix(OMN-15918): bind OCC companion to PR

[jonahgabriel]

Summary

• add the missing OCC self-bind evidence item and PASS receipt for evidence(OMN-15918): OCC companion for OmniNode-ai/omnibase_infra#2727 #6396
• make OMN-15918 eligibility associate the evidence set with the OCC PR itself

Verification

• exact validator_occ_merge_eligibility reproduction: eligible=true
• append-only validator: PASS
• validate-yaml contracts/OMN-15918.yaml: PASS
• changed-file pre-commit hooks: PASS

Stacked-Parent: #6396

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