evidence(OMN-14376): OCC companion for omnibase_infra PR 2261

[jonahgabriel]

Summary

Net-new OCC companion for OMN-14376 (default onex delegate to the system-configured event bus, omnibase_infra#2261).

Authored under the OMN-14055-sanctioned independent-verifier escape hatch (verifier != implementer): sc-reconcile independently verified this PR — read the full diff, checked out the branch in an isolated worktree, ran the full focused suite green (39/39), then performed two RED->GREEN mutation proofs. runner: bus-fix-14376 (the session lane that built #2261, per docs/tracking/ROLLING_WORK_LEDGER.md), verifier: sc-reconcile (independent).

Mutation proof 1 (probe-then-select branching in resolve_default_bus): forcing it to always return "kafka" regardless of probe health broke 5 of 8 targeted tests. Mutation proof 2 (bare --kafka-bootstrap usage-error guard): removing the guard did NOT break the PR's own 2 dedicated tests (a pre-existing downstream build_backend_overrides guard catches the "env unset" case redundantly), so a third hand-written scenario was run directly against run_delegate with KAFKA_BOOTSTRAP_SERVERS set to a broker different from an explicitly-passed kafka_bootstrap and --bus omitted — the mutated code silently resolved via the env broker with no error, the original code correctly raised ValueError. This confirms the guard is real and load-bearing; noted as a minor test-coverage gap in the PR's own suite, not a functional defect.

• contracts/OMN-14376.yaml — central contract, 3 dod_evidence items
• drift/dod_receipts/OMN-14376/dod-omnibase-infra-pr-2261-head-c22182ed/command.yaml — product proof receipt
• drift/dod_receipts/OMN-14376/dod-deploy-assessment-head-c22182ed/command.yaml — deploy-surface assessment (CLI-only diff, no live deploy)
• drift/dod_receipts/OMN-14376/dod-occ-self-commit/command.yaml — OCC self-binding receipt

All net-new files (OMN-13888 whole-file-hash rule); no existing receipt/contract edited.

Evidence-Ticket: OMN-14376

Test plan

• uv run pre-commit run --files contracts/OMN-14376.yaml drift/dod_receipts/OMN-14376/**/*.yaml — all hooks green
• CI on this PR (occ-preflight, Contract Compliance, etc.)

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

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📥 Commits

Reviewing files that changed from the base of the PR and between 97e704f and b3c7501.

📒 Files selected for processing (4)

• contracts/OMN-14376.yaml
• drift/dod_receipts/OMN-14376/dod-deploy-assessment-head-c22182ed/command.yaml
• drift/dod_receipts/OMN-14376/dod-occ-self-commit/command.yaml
• drift/dod_receipts/OMN-14376/dod-omnibase-infra-pr-2261-head-c22182ed/command.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jonah/omn-14376-occ-infra-2261

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