fix(OMN-13408): OCC contract — extend to tokens dimension (tokens_input/tokens_output carry)

[jonahgabriel]

OMN-13408 — OCC contract extension: tokens dimension

Sibling half of the already-landed cost_usd fix (omnimarket #1332 / OCC contract #2890 + receipt #2894). This PR additively extends the existing contracts/OMN-13408.yaml to cover the tokens_input/tokens_output dimension — it does not duplicate the ticket or create a new contract.

What changed

• contracts/OMN-13408.yaml — title/summary now describe both dimensions; new dod-tokens evidence item binds the tokens regression test.
• drift/dod_receipts/OMN-13408/dod-tokens/command.yaml — new paired receipt for the tokens evidence item (verifier ≠ runner; probe_stdout captured).
• drift/dod_receipts/OMN-13408/dod-001/command.yaml + dod-occ-pr/command.yaml — re-bound contract_sha256 to the current contract hash (the contract mutated; both probes re-run, still PASS). Receipt Hardening Gate requires receipt sha to match sha256(contracts/OMN-13408.yaml).

Product PRs this contract governs (tokens dimension)

• omnibase_core fix(OMN-11424): hash-bind receipt gate evidence #1300 — adds additive fields tokens_input/tokens_output (int, default=0, ge=0) on the canonical wire DTO ModelTaskDelegatedEvent.
• omnimarket evidence(OMN-11623): bind market delegation proof #1336 — populates them from served prompt/completion tokens on both terminal compat paths in HandlerDelegationWorkflow, with regression test tests/unit/delegation/test_compat_event_tokens_not_clobbered_omn13408.py (fails pre-fix at tokens_input=0/tokens_output=0, passes post-fix).

Both product PRs will pin Evidence-Source to this PR's squash merge-commit (OCC squash invalidates a pre-squash Evidence-Source SHA).

Honest scope note

The fix is the additive wire + compat carry only. An independent DEV-lane live projection readback (correlation_id badf851a, terminal topic onex.evt.omnibase-infra.delegation-failed.v1) still reads tokens_input=0/tokens_output=0 because served Gemini usage is dropped upstream before response.prompt_tokens / workflow.inference_*_tokens are read on the escalated-failed path. Threading the served usage into the canonical terminal event on that path is a separate follow-on. No buyer-facing savings claim — measured DEV proof only (OMN-12296 Integration Lock in force).

dod_evidence

• dod-001 (cost test, re-bound) — PASS
• dod-tokens (tokens regression test) — PASS
• dod-occ-pr (self-binding OCC receipt, re-bound) — PASS

Receipt Honesty + Receipt Hardening gates pass locally (pre-commit run --all).

Epic: OMN-13471. Parent: OMN-12296.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 7862bb86-6948-48d3-9102-49c77d9e362c

📥 Commits

Reviewing files that changed from the base of the PR and between 33c69fc and e062be7.

📒 Files selected for processing (4)

• contracts/OMN-13408.yaml
• drift/dod_receipts/OMN-13408/dod-001/command.yaml
• drift/dod_receipts/OMN-13408/dod-occ-pr/command.yaml
• drift/dod_receipts/OMN-13408/dod-tokens/command.yaml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch jonah/omn-13408-occ-tokens

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