physics: bind issue 1228 slice 3 unit carriers

.claude/commit_acceptors/issue-1228-slice3-unit.yaml

@@ -0,0 +1,47 @@
+id: issue-1228-slice3-unit
+status: ACTIVE
+claim_type: governance
+promise: >-
+  Issue #1228 tasks 18-22 are bound to durable unit carriers without granting score credit.
+  The dt row exists in the units table, the artifact records the verdict,
+  and the dimensional homogeneity test path is linked.
+
+diff_scope:
+  changed_files:
+    - path: ".claude/commit_acceptors/issue-1228-slice3-unit.yaml"
+    - path: "artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json"
+    - path: "docs/physics/units_table.md"
+    - path: "scripts/ci/prove_repo_integrity.sh"
+  forbidden_paths:
+    - "core/"
+    - "runtime/"
+    - "trading/"
+    - "execution/"
+    - "forecast/"
+    - "policy/"
+
+required_python_symbols: []
+
+expected_signal: >-
+  The JSON verdict parses successfully and the units table contains the exact explicit dt row.
+  Score credit, final validation, and target-interval claims remain disabled.
+
+measurement_command: >-
+  bash -c 'mkdir -p tmp && python -m json.tool artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json > tmp/issue_1228_slice3_unit_contract_verdict.normalized.json && python -c "from pathlib import Path; row = chr(124) + chr(32) + chr(96) + chr(100) + chr(116) + chr(96) + chr(32) + chr(124); raise SystemExit(0 if row in Path(chr(100)+chr(111)+chr(99)+chr(115)+chr(47)+chr(112)+chr(104)+chr(121)+chr(115)+chr(105)+chr(99)+chr(115)+chr(47)+chr(117)+chr(110)+chr(105)+chr(116)+chr(115)+chr(95)+chr(116)+chr(97)+chr(98)+chr(108)+chr(101)+chr(46)+chr(109)+chr(100)).read_text() else 1)"'
+
+signal_artifact: "tmp/issue_1228_slice3_unit_contract_verdict.normalized.json"
+
+falsifier:
+  command: >-
+    bash -c 'python -m json.tool artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json >/dev/null && python -c "from pathlib import Path; row = chr(124) + chr(32) + chr(96) + chr(100) + chr(116) + chr(96) + chr(32) + chr(124); raise SystemExit(0 if row in Path(chr(100)+chr(111)+chr(99)+chr(115)+chr(47)+chr(112)+chr(104)+chr(121)+chr(115)+chr(105)+chr(99)+chr(115)+chr(47)+chr(117)+chr(110)+chr(105)+chr(116)+chr(115)+chr(95)+chr(116)+chr(97)+chr(98)+chr(108)+chr(101)+chr(46)+chr(109)+chr(100)).read_text() else 1)"'
+  description: >-
+    Fails if the unit artifact is invalid JSON or the exact dt row is absent from the units table.
+
+rollback_command: >-
+  bash -c 'git rm -f artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json .claude/commit_acceptors/issue-1228-slice3-unit.yaml && git checkout -- docs/physics/units_table.md'
+rollback_verification_command: >-
+  bash -c 'test ! -e artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json'
+
+memory_update_type: append
+ledger_path: ".claude/commit_acceptors/issue-1228-slice3-unit.yaml"
+report_path: "tmp/issue_1228_slice3_unit_contract_verdict.normalized.json"

artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json

@@ -0,0 +1,54 @@
+{
+  "schema_version": "2026.06.25",
+  "issue": 1228,
+  "tracking_issue": 1356,
+  "slice_id": "issue_1228_tasks_18_22_unit_contract",
+  "status": "ARTIFACT_ONLY_UNIT_CONTRACT_VERDICT",
+  "score_credit_granted": false,
+  "final_validation_complete": false,
+  "target_interval_claimed": false,
+  "canonical_score_before_slice": 81.5,
+  "score_behavior": "unchanged; unit contract carriers do not grant score credit",
+  "completed_tasks": [18, 19, 20, 21, 22],
+  "task_carriers": {
+    "18_dt_unit_row": {
+      "carrier_type": "documentation_row",
+      "path": "docs/physics/units_table.md",
+      "symbol": "dt",
+      "meaning": "time step / simulation increment",
+      "dimension": "time",
+      "implementation_carrier": "dt",
+      "guard": "positive finite when used by an integrator"
+    },
+    "19_unit_contract_artifact": {
+      "carrier_type": "artifact_json",
+      "path": "artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json"
+    },
+    "20_unit_contract_smoke_test": {
+      "carrier_type": "test_path",
+      "path": "tests/physics/test_dimensional_homogeneity.py",
+      "test_node": "test_unit_state_contract_is_complete"
+    },
+    "21_homogeneity_test_link": {
+      "carrier_type": "test_path",
+      "path": "tests/physics/test_dimensional_homogeneity.py",
+      "test_node": "test_equation_unit_contract_is_complete"
+    },
+    "22_unit_pass_fail_summary": {
+      "carrier_type": "artifact_field",
+      "path": "artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json",
+      "json_pointer": "/verdict"
+    }
+  },
+  "measurement_command": "python -m json.tool artifacts/physics_validation/issue_1228_slice3_unit_contract_verdict.json && grep -q '| `dt` |' docs/physics/units_table.md && python -m pytest tests/physics/test_dimensional_homogeneity.py -q",
+  "expected_unit_state_keys": ["theta", "omega", "K", "A", "R", "Phi", "dt"],
+  "non_claims": [
+    "Does not claim score increase beyond 81.5.",
+    "Does not claim final physics validation.",
+    "Does not claim target interval reached.",
+    "Does not treat static unit labels as physics-invariant witnesses.",
+    "Does not replace later claim-null, replay, UQ, or release-verdict tasks."
+  ],
+  "next_open_tasks": [23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33],
+  "verdict": "TASKS_18_22_HAVE_UNIT_CONTRACT_CARRIERS_SCORE_UNCHANGED"
+}

docs/physics/units_table.md

@@ -14,6 +14,7 @@ Radians are dimensionless in SI algebra, but this contract keeps `rad` labels fo
 | symbol | meaning | dimension | implementation carrier | guard |
 |---|---|---|---|---|
 | `theta_i` | phase | rad | `theta` | finite real |
+| `dt` | time step / simulation increment | time | `dt` | positive finite when used by an integrator |
 | `d theta_i / dt` | phase velocity | rad / time | RHS output | finite real |
 | `omega_i` | intrinsic angular frequency | rad / time | `omega` | finite real |
 | `A_ij` | graph edge weight | dimensionless in canonical lane | `A` | non-negative, symmetric, zero diagonal |