feat(OMN-10481): add ab compare CLI receipt evidence

contracts/OMN-10481.yaml

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+---
+schema_version: "1.0.0"
+ticket_id: OMN-10481
+title: "Add ab-compare CLI wrapper"
+summary: "Add a thin ab-compare CLI over the A/B compare orchestrator with table and JSON output while
+  preserving node metadata and drift validation."
+is_seam_ticket: true
+interface_change: true
+interfaces_touched:
+  - "public_api"
+evidence_requirements:
+  - kind: "manual"
+    description: "Focused ab-compare CLI unit tests pass"
+    command: "uv run pytest tests/unit/test_cli_ab_compare.py -q"
+  - kind: "manual"
+    description: "Node metadata dependency scope validates handler imports"
+    command: "uv run python scripts/ci/check_node_metadata_dependencies.py"
+  - kind: "manual"
+    description: "Node drift gate validates changed node package registration"
+    command: "python scripts/validate_node_drift.py --check-changed origin/main --strict"
+emergency_bypass:
+  enabled: false
+  justification: ""
+  follow_up_ticket_id: ""
+dod_evidence:
+  - id: "dod-001"
+    description: "Focused ab-compare CLI unit tests pass"
+    source: "manual"
+    checks:
+      - check_type: "command"
+        check_value: "test -f drift/dod_receipts/OMN-10481/dod-001/command.yaml"
+  - id: "dod-002"
+    description: "Node metadata dependency scope validates handler imports"
+    source: "manual"
+    checks:
+      - check_type: "command"
+        check_value: "test -f drift/dod_receipts/OMN-10481/dod-002/command.yaml"
+  - id: "dod-003"
+    description: "Node drift gate validates changed node package registration"
+    source: "manual"
+    checks:
+      - check_type: "command"
+        check_value: "test -f drift/dod_receipts/OMN-10481/dod-003/command.yaml"

drift/dod_receipts/OMN-10481/dod-001/command.yaml

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+---
+schema_version: "1.0.0"
+ticket_id: OMN-10481
+evidence_item_id: dod-001
+check_type: command
+check_value: "test -f drift/dod_receipts/OMN-10481/dod-001/command.yaml"
+status: PASS
+run_timestamp: "2026-05-02T01:06:55Z"
+commit_sha: "3990bd84578a"
+runner: codex-gpt5
+verifier: jonahgabriel
+probe_command: "uv run pytest tests/unit/test_cli_ab_compare.py -q"
+probe_stdout: |
+  17 passed, 2 warnings in 0.05s
+actual_output: >-
+  PASS: focused ab-compare CLI unit tests validate table rendering, JSON rendering, argument handling,
+  and orchestrator invocation.
+exit_code: 0
+pr_number: 512

drift/dod_receipts/OMN-10481/dod-002/command.yaml

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+---
+schema_version: "1.0.0"
+ticket_id: OMN-10481
+evidence_item_id: dod-002
+check_type: command
+check_value: "test -f drift/dod_receipts/OMN-10481/dod-002/command.yaml"
+status: PASS
+run_timestamp: "2026-05-02T01:06:55Z"
+commit_sha: "3990bd84578a"
+runner: codex-gpt5
+verifier: jonahgabriel
+probe_command: "uv run python scripts/ci/check_node_metadata_dependencies.py"
+probe_stdout: |
+  ONCP node metadata dependency scope: PASS
+actual_output: >-
+  PASS: node_ab_compare_orchestrator metadata declares the third-party imports used by its handler, including
+  anthropic and httpx.
+exit_code: 0
+pr_number: 512

drift/dod_receipts/OMN-10481/dod-003/command.yaml

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+---
+schema_version: "1.0.0"
+ticket_id: OMN-10481
+evidence_item_id: dod-003
+check_type: command
+check_value: "test -f drift/dod_receipts/OMN-10481/dod-003/command.yaml"
+status: PASS
+run_timestamp: "2026-05-02T01:06:55Z"
+commit_sha: "3990bd84578a"
+runner: codex-gpt5
+verifier: jonahgabriel
+probe_command: "python scripts/validate_node_drift.py --check-changed origin/main --strict"
+probe_stdout: |
+  node-drift-gate (strict mode): 149 node(s) checked
+    PASS: 35  WARN: 114  FAIL: 0
+  node-drift-gate: PASS
+actual_output: >-
+  PASS: changed node package registration is drift-clean after rebasing OMN-10481 onto current omnimarket
+  main.
+exit_code: 0
+pr_number: 512