# Evidence: Block 20 · Service (block-20)

- block type: block
- date: 2026-08-22
- resulting state: closed/verified
- story points (combined assembled cost): 56881
- execution id: 20260823.030840.777Z-b10f3c99

## Stories built
- Implement lexical labels and breaks. (FLOW-004) [story]

## Acceptance tooling authorization
- FEATURE-FLOW-004.md#flow-004-conformance: executable=python3; scope=test; authorization=existing Target environment

## Stacked context
- compass: COMPASS.md (SP 3420)
- implements: FEATURE-FLOW-004.md (SP 392)
- context: parser.y (SP 5596)
- context: jq-manual.txt (SP 32696)
- context: jq.test (SP 13058)
- context: ARCHITECTURE_compact.md (SP 154)
- stack: python_compact.md (SP 1534)

## Build directory changes
- jq_interpreter/parser.py
- tests/test_flow_004_labels_breaks.py

## Pre-build acceptance observation
- GREEN (prepassed): flow-004-conformance (FEATURE-FLOW-004.md)
  intent: The implementation passes the authoritative corpus slice covering labels and breaks.
  return code: 0
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 7,
        "fail": 0,
        "error": 0,
        "skip": 0
      },
      "cases": []
    }

## Post-build programmatic acceptance
- PASS: flow-004-conformance (FEATURE-FLOW-004.md)
  intent: The implementation passes the authoritative corpus slice covering labels and breaks.
  target interpreter: /mnt/c/Users/barlo/projects/drydock/.venv/bin/python3
  provisioning: not required
  return code: 0
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 7,
        "fail": 0,
        "error": 0,
        "skip": 0
      },
      "cases": []
    }

## Build summary
RESULT: SUCCESS

FILES CHANGED:
- jq_interpreter/parser.py
- tests/test_flow_004_labels_breaks.py

SUMMARY:
Implemented AST-based lexical label validation and added FLOW-004 coverage. All 96 tests pass; scoped conformance passes 7/7.

BLOCKERS:
- None