# Evidence: Block 41 · Service (block-41)

- block type: block
- date: 2026-08-23
- resulting state: closed/verified
- story points (combined assembled cost): 53670
- execution id: 20260823.115246.709Z-e65b4efc

## Stories built
- Implement streaming transformations. (IO-003) [story]

## Stacked context
- compass: COMPASS.md (SP 3420)
- implements: FEATURE-IO-003.md (SP 375)
- context: builtin.jq (SP 2408)
- 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/evaluator.py
- jq_interpreter/parser.py
- tests/test_stream_evaluator.py

## Pre-build acceptance observation
- RED: io-003-conformance (FEATURE-IO-003.md)
  intent: The streaming transformation cases selected from the authoritative corpus execute and pass.
  return code: 1
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 0,
        "fail": 0,
        "error": 0,
        "skip": 0
      },
      "cases": []
    }
  stderr:
    --- drydock: progress ---
    cases: pass=0 fail=0 error=0 skip=0 total=0 from=summary
    --- drydock: end progress ---
    --- drydock: values at failure ---
      summary = {'pass': 0, 'fail': 0, 'error': 0, 'skip': 0}
    --- drydock: end values ---
    Traceback (most recent call last):
      File "io-003-conformance.py", line 17, in <module>
        assert sum(summary.values()) > 0
               ^^^^^^^^^^^^^^^^^^^^^^^^^
    AssertionError

## Post-build programmatic acceptance
- UNVERIFIED: io-003-conformance (FEATURE-IO-003.md)
  intent: The streaming transformation cases selected from the authoritative corpus execute and pass.
  target interpreter: /mnt/c/Users/barlo/projects/drydock/.venv/bin/python3
  provisioning: not required
  return code: 1
  error: unverified acceptance: selector matched zero cases
  stdout:
    {
      "candidate": [
        "/mnt/c/Users/barlo/projects/drydock/uat/jq/runs/20260822.044627/build/jq/jq"
      ],
      "corpus": "jq.test",
      "summary": {
        "pass": 0,
        "fail": 0,
        "error": 0,
        "skip": 0
      },
      "cases": []
    }
  stderr:
    --- drydock: progress ---
    cases: pass=0 fail=0 error=0 skip=0 total=0 from=summary
    --- drydock: end progress ---
    --- drydock: values at failure ---
      summary = {'pass': 0, 'fail': 0, 'error': 0, 'skip': 0}
    --- drydock: end values ---
    Traceback (most recent call last):
      File "io-003-conformance.py", line 17, in <module>
        assert sum(summary.values()) > 0
               ^^^^^^^^^^^^^^^^^^^^^^^^^
    AssertionError

## Build summary
Implemented streaming transformations:

- Added `tostream`, `fromstream`, and `truncate_stream`.
- Preserved depth-first ordering and stream record shapes.
- Added focused tests; 10 streaming tests pass.
- Conformance selector matched zero staged cases because `jq.test` contains no streaming names.

AC_BROKEN: io-003-conformance

RESULT: SUCCESS

FILES CHANGED:
- jq_interpreter/evaluator.py
- jq_interpreter/parser.py
- tests/test_stream_evaluator.py

SUMMARY:
Streaming filters implemented and locally verified, including round-trip reconstruction and truncation.

BLOCKERS:
- Declared conformance criterion is broken by the staged corpus containing zero matching cases.