---
id: OBPI-0.0.23-05-audit-check-covers-backfill-heuristic
parent: ADR-0.0.23-agent-failure-mode-taxonomy
item: 5
lane: Heavy
status: Completed
---

# OBPI-0.0.23-05-audit-check-covers-backfill-heuristic: Same-commit `@covers` backfill heuristic for `gz adr audit-check`

## ADR Item

- **Source ADR:** `docs/design/adr/foundation/ADR-0.0.23-agent-failure-mode-taxonomy/ADR-0.0.23-agent-failure-mode-taxonomy.md`
- **Checklist Item:** #5 - "OBPI-0.0.23-05: Operationalize `Skipped cheap verification` shape — add same-commit-window `@covers` backfill heuristic to `gz adr audit-check` with `data/audit_thresholds.json` thresholds; warn by default, fail-closed under `--strict` and on heavy/foundation lanes (closes GHI #309)"

**Status:** Draft

## Objective

Operationalize the `Skipped cheap verification` failure shape (codified in OBPI-0.0.23-01's taxonomy rule, derived from Claude Opus 4.7 system card § 2.3.6 and corroborated by the GPT-5.5 system card § 9.2 Apollo evaluations) at the `gz adr audit-check` validator surface. Today, `gz adr audit-check` accepts any `@covers(REQ-...)` decorator at face value — a cosmetic backfill (decorating an existing test with a new `@covers` tag in the same commit as the closing receipt for that REQ, without re-deriving the assertion from REQ semantics) silences the audit without delivering the verification it claims. This OBPI adds a temporal heuristic: scan the git history for each `@covers(REQ-X.Y.Z-NN-MM)` decorator's introduction and compare against the closing receipt window for that REQ; flag any decorator added in the same commit as (or within N commits / D days of) the closing receipt. Thresholds are exposed via `data/audit_thresholds.json` (`max_covers_backfill_commits`, `max_covers_backfill_days`); default behavior is warning-level on lite lanes and informational ADR-status output, fail-closed under `--strict` and on heavy / foundation-kind lanes per the brief-level Gate 5 inheritance matrix in `AGENTS.md` § OBPI Acceptance Protocol. Test fixtures cover the two halves of the contract: an `@covers` decorator landed 30 commits before the REQ's closing receipt passes (legitimate evolution); a same-commit `@covers` + closing-receipt pair fails. The heuristic catches the GHI #272 anti-pattern at audit time without false-positiving long-lived tests that legitimately gain new REQ coverage as doctrine evolves. Closes GHI #309.

## Lane

**Heavy** - This OBPI changes a command/API/schema/runtime contract surface.

> Heavy is reserved for command/API/schema/runtime-contract changes. Process,
> documentation, and template-only work stays Lite unless it changes one of
> those external surfaces.

The change is additive validator scope inside an existing CLI verb (`gz adr audit-check`), and it introduces a new threshold-data file (`data/audit_thresholds.json`) and a new `--strict` flag affordance — both heavy-lane triggers per `.claude/rules/cli.md` § New Flag and the runtime-contract column of the lane matrix. The parent ADR is already heavy (lifted by OBPI-0.0.23-04's new `gz issue file` verb), so this OBPI lands inside the existing heavy envelope without further lift.

## Allowed Paths

<!-- What files/directories are IN SCOPE? Be explicit with paths. -->

- `src/gzkit/commands/adr_audit.py` — extend `gz adr audit-check` to call the heuristic; thread the threshold config and `--strict` flag through (target file is already over the 600-line cap, so heuristic logic itself lands in the sibling module below — see operator decision Q1=A in plan)
- `src/gzkit/commands/adr_audit_covers_backfill.py` — sibling module hosting the heuristic logic, the Pydantic threshold model, the git-history wrapper, and the finding/severity types (widened from the original brief at plan-audit time per Q1=A; mirrors the `security_surfaces.py` precedent)
- `src/gzkit/cli/parser_artifacts.py` — register the `--strict` flag on `gz adr audit-check` (verb is registered here)
- `data/audit_thresholds.json` — new threshold-config file with `max_covers_backfill_commits` and `max_covers_backfill_days` keys; default values per the GHI body (3 commits, 7 days)
- `src/gzkit/schemas/audit_thresholds.json` — JSON Schema for the threshold file (mirrors `security_surfaces.json` shape)
- `tests/governance/test_audit_check_covers_backfill.py` — REQ-derived unit tests with mocked git history boundary
- `tests/fixtures/adr_audit_covers_backfill/` — fixture directory with two ADR shapes (legitimate-evolution, same-commit-backfill)
- `features/adr_audit_covers_backfill.feature` — BDD scenario covering heavy-lane fail-closed behavior end-to-end
- `features/steps/adr_audit_covers_backfill_steps.py` — step definitions for the BDD scenario
- `docs/user/manpages/gz-adr-audit-check.md` — verb-specific manpage documenting the new `--strict` flag, heuristic behavior, threshold file, exit codes, and examples (per Q3=A; "or sibling manpage" affordance in REQ-12)
- `docs/user/manpages/index.md` — manpage index entry for the new manpage (REQ-13 parity)
- `docs/user/commands/adr-audit-check.md` — update existing command doc with `--strict` and threshold semantics
- `docs/user/runbook.md` — runbook entry referencing the heuristic when audit-check fails on backfill
- `src/gzkit/commands/init_cmd.py` — production `gz init` scaffolds `data/audit_thresholds.json` (added at plan-execution time per operator decision A; the heuristic forbids silent-fallback to defaults so every gzkit workspace must carry the file)
- `tests/commands/common.py` — `_quick_init` test helper mirrors the production `data/audit_thresholds.json` scaffolding so existing test fixtures don't break when the heuristic activates
- `docs/design/adr/foundation/ADR-0.0.23-agent-failure-mode-taxonomy/**` — parent ADR package scope (evidence updates, completion checklist)

## Denied Paths

<!-- What files/directories are OUT OF SCOPE? Agents will not touch these. -->

- `.gzkit/rules/agent-failure-modes.md` and its mirrors — owned by OBPI-0.0.23-01 / -03
- `AGENTS.md`, `docs/governance/advisory-rules-audit.md` — owned by OBPI-0.0.23-02
- `.gzkit/rules/gh-cli.md`, `src/gzkit/commands/issue_cmd.py`, `docs/user/manpages/gz-issue.md`, `features/issue_file.feature` — owned by OBPI-0.0.23-04
- `.gzkit/manifest.json` — only `gz agent sync control-surfaces` may modify
- `.gzkit/ledger.jsonl` — only canonical `gz` commands may write
- New runtime dependencies (the heuristic uses git via the existing subprocess wrapper; no new Python deps)
- CI workflow files, lockfiles
- Any path not listed in Allowed Paths

## Requirements (FAIL-CLOSED)

<!-- Constraints that MUST hold. Numbered list. NEVER/ALWAYS language.
     These are the rules agents ground against. If not met, OBPI fails. -->

1. REQUIREMENT: `gz adr audit-check ADR-X.Y.Z` MUST scan every `@covers(REQ-X.Y.Z-NN-MM)` decorator under `tests/**` whose REQ matches the audited ADR, compute the introducing commit for each decorator via git history, and compute the closing-receipt commit/date for the corresponding REQ; for each decorator, compute the gap (commits between introduction and closing receipt; days between introduction date and closing receipt date).
2. REQUIREMENT: A decorator whose gap is `<= max_covers_backfill_commits` OR `<= max_covers_backfill_days` MUST be flagged as a same-commit-window backfill candidate; the gap is the smaller of the two thresholds (i.e. fire on either condition, not both).
3. REQUIREMENT: `data/audit_thresholds.json` MUST exist with at least the keys `max_covers_backfill_commits` (integer, default 3) and `max_covers_backfill_days` (integer, default 7). The file is Pydantic-validated against `src/gzkit/schemas/audit_thresholds.json` (`frozen=True`, `extra="forbid"`); a missing or malformed file MUST exit 1 with a diagnostic that names the file and the validation failure, NEVER silently fall back to compiled-in defaults at runtime.
4. REQUIREMENT: For lite-lane ADRs without `--strict`, flagged backfills surface as warning-level output (file:line of the decorator, REQ id, gap in commits/days, closing-receipt commit SHA) and exit 0; the warning is informational, not blocking.
5. REQUIREMENT: For heavy-lane OR foundation-kind ADRs, OR any invocation with `--strict`, flagged backfills MUST exit 3 (policy breach per `.claude/rules/cli.md` § Exit Codes) with the same diagnostic content as the lite-lane warning plus a remediation hint pointing at `.claude/rules/tests.md` § "Tests assert semantics, not strings" (Invariant 6f).
6. REQUIREMENT: Output for both lanes MUST include for each flagged decorator: the source file path, the line number of the decorator, the REQ id, the introducing commit SHA (short form), the closing receipt event id (or commit SHA if the REQ has no formal receipt), and the computed gap (`Nc commits / Dd days`).
7. REQUIREMENT: A `@covers` decorator whose introducing commit predates the closing receipt by MORE THAN both thresholds MUST NOT be flagged (the legitimate-evolution case from the GHI body).
8. REQUIREMENT: When git history is unavailable (shallow clone, missing object, etc.), the heuristic MUST surface a diagnostic identifying which decorator could not be resolved and exit 2 (system error) under `--strict`; under default mode, surface the diagnostic and continue (skipping the unresolvable decorator only, not the audit as a whole).
9. REQUIREMENT: Unit tests MUST mock the git-history boundary (use a helper fixture that constructs a temp repo with controlled commit dates / SHAs); NEVER reach the live repository's git history from `tests/`.
10. REQUIREMENT: At least one fixture pair MUST cover the legitimate-evolution case (decorator landed 30+ commits before closing receipt — passes) and the same-commit-backfill case (decorator + closing receipt in the same commit — fails under `--strict`). Both fixtures live under `tests/fixtures/adr_audit_covers_backfill/`.
11. REQUIREMENT: At least one BDD scenario MUST cover the heavy-lane fail-closed end-to-end and carry a scenario tag matching one of the REQ ids below per `.gzkit/rules/tests.md` § Behave scenario tagging.
12. REQUIREMENT: The manpage at `docs/user/manpages/gz-adr.md` (audit-check section, or sibling manpage) MUST document the new `--strict` flag, the heuristic's behavior, the threshold file location and keys, and at least one example output.
13. REQUIREMENT: `gz cli audit` MUST exit 0 after the new `--strict` flag is registered (manpage + command doc + index parity per `.claude/rules/cli.md` § Consistency).
14. REQUIREMENT: ARB receipts MUST exist for every heavy-lane Gate (lint, typecheck, unittest, coverage, mkdocs, behave) and be cited in the closing attestation per `AGENTS.md` § Attestation. NEVER cite a receipt id without verifying the receipt exists.
15. REQUIREMENT: NEVER include the operator's personal email in any default output, diagnostic, manpage example, or test fixture — `AGENTS.md` § Local Agent Rules applies.
16. REQUIREMENT: Tests MUST assert REQ-derived semantics (the heuristic's purpose: "flag same-commit `@covers` + closing-receipt pairs"), NOT byte-level strings of the current diagnostic shape, per `.gzkit/rules/tests.md` § Tests assert semantics, not strings (Invariant 6f). Output-form fixtures (if any) live in a separate test class per the rule's Output-form fixture carve-out.

> STOP-on-BLOCKERS: STOP if `src/gzkit/commands/adr_audit.py` cannot be located, if the existing `gz adr audit-check` verb is not registered, or if a sibling OBPI under this ADR is mid-flight on overlapping paths (use `gz obpi lock-status` to check).

## Discovery Checklist

<!-- What to read before implementation. Complete this checklist first. -->

**Governance (read once, cache):**

- [ ] `.github/discovery-index.json` - repo structure
- [ ] `AGENTS.md` or `CLAUDE.md` - agent operating contract
- [ ] Parent ADR - understand full context

**Context:**

- [ ] Parent ADR: `docs/design/adr/foundation/ADR-0.0.23-agent-failure-mode-taxonomy/ADR-0.0.23-agent-failure-mode-taxonomy.md`
- [ ] Related OBPIs in same ADR (especially -01 for the taxonomy rule the heuristic operationalizes)
- [ ] GHI #309 body (the prescriptive source for this brief)
- [ ] GHI #272 body (the original cosmetic-backfill anti-pattern this heuristic mechanizes)

**Prerequisites (check existence, STOP if missing):**

- [ ] Required path exists: `src/gzkit/commands/adr_audit.py`
- [ ] Required path exists: `docs/design/adr/foundation/ADR-0.0.23-agent-failure-mode-taxonomy/ADR-0.0.23-agent-failure-mode-taxonomy.md`
- [ ] `gz adr audit-check --help` exits 0 (existing verb registered)
- [ ] No overlapping in-flight OBPI: `uv run gz obpi lock-status` shows no claim on `adr_audit.py` or `data/audit_thresholds.json`

**Surface and rule context (read before authoring):**

- [ ] `.claude/rules/cli.md` § Adding CLI Features → New Flag (lite-additive vs heavy threshold) and § Exit Codes (0/1/2/3 map)
- [ ] `.claude/rules/tests.md` § Tests assert semantics, not strings (Invariant 6f) AND § Output-form fixture carve-out
- [ ] `.claude/rules/adr-audit.md` (current audit semantics, the surface this heuristic extends)
- [ ] `.claude/rules/models.md` (Pydantic + `ConfigDict(frozen=True, extra="forbid")` for the threshold schema)
- [ ] `.gzkit/rules/tests.md` § Behave scenario tagging (`@REQ-X.Y.Z-NN-MM` format)
- [ ] `AGENTS.md` § Attestation (ARB receipt discipline for heavy-lane gates)

**Existing Code (understand current state):**

- [ ] `src/gzkit/commands/adr_audit.py` — current `gz adr audit-check` implementation; locate the `@covers` resolution path
- [ ] Existing `data/*.json` thresholds files (if any) for naming/loading convention parity
- [ ] Existing tests for `gz adr audit-check` to identify the right mock boundary for git-history calls

## Quality Gates

<!-- Which gates apply and how to verify them. -->

### Gate 1: ADR

- [ ] Intent and scope recorded in this OBPI brief
- [ ] Parent ADR checklist item quoted

### Gate 2: TDD (Red-Green-Refactor)

- [ ] Tests derived from brief acceptance criteria, not from implementation
- [ ] Red-Green-Refactor cycle followed per behavior increment
- [ ] Tests pass: `uv run gz test`
- [ ] Validation commands recorded in evidence with real outputs

### Code Quality

- [ ] Lint clean: `uv run gz lint`
- [ ] Type check clean: `uv run gz typecheck`

<!-- Heavy lane only: -->
### Gate 3: Docs (Heavy only)

- [ ] Docs build: `uv run mkdocs build --strict`
- [ ] Manpage updated for `--strict` flag and heuristic behavior
- [ ] Runbook entry references the heuristic

### Gate 4: BDD (Heavy only)

- [ ] Acceptance scenarios pass: `uv run -m behave features/`
- [ ] Heavy-lane fail-closed scenario tagged with matching `@REQ-0.0.23-05-NN`

### Gate 5: Human (Heavy only)

- [ ] Human attestation recorded (foundation-kind × heavy-lane brief-level Gate 5 per matrix)

## Verification

<!-- What commands verify this work? Use real repo commands, then paste the
     outputs into Evidence. -->

Landed gz verbs (fail-fast as written):

```bash
# Authored-rule + manpage + brief integrity
uv run gz validate --documents
uv run gz validate --surfaces
uv run gz validate --brief-headings
uv run gz validate --behave-req-tags

# CLI surface coverage
uv run gz cli audit

# Code quality (Heavy lane gates)
uv run gz lint
uv run gz typecheck
uv run gz test
uv run mkdocs build --strict

# Specific paths exist (post-implementation)
test -f data/audit_thresholds.json
test -f src/gzkit/schemas/audit_thresholds.json
test -f tests/fixtures/adr_audit_covers_backfill/
test -f features/adr_audit_covers_backfill.feature
```

Heuristic-specific smoke checks (post-implementation):

- `uv run gz adr audit-check ADR-X.Y.Z --help` MUST list `--strict`
- `uv run gz adr audit-check ADR-<lite>` against the legitimate-evolution fixture MUST exit 0
- `uv run gz adr audit-check ADR-<lite> --strict` against the same-commit-backfill fixture MUST exit 3 with the file:line + REQ id + gap diagnostic
- `uv run gz adr audit-check ADR-<heavy-fixture>` against the same-commit-backfill fixture MUST exit 3 even without `--strict` (heavy-lane inheritance)
- `uv run -m behave features/adr_audit_covers_backfill.feature` MUST pass on Heavy-lane Gate 4

## Acceptance Criteria

<!--
Specific, testable criteria for completion.
Each checkbox MUST carry a deterministic REQ ID:
REQ-<semver>-<obpi_item>-<criterion_index>
-->

- [ ] REQ-0.0.23-05-01: Given an ADR whose REQ has a closing receipt at commit C, when a `@covers(REQ-...)` decorator was introduced in commit C (or within `max_covers_backfill_commits` commits, or within `max_covers_backfill_days` days, of C), then `gz adr audit-check` flags the decorator with file:line, REQ id, introducing commit SHA, closing-receipt id, and the computed gap.
- [ ] REQ-0.0.23-05-02: Given the same scenario as REQ-...-01, when the audited ADR is lite-lane and `--strict` is NOT set, then the flagged decorator surfaces as a warning and the command exits 0.
- [ ] REQ-0.0.23-05-03: Given the same scenario, when the audited ADR is heavy-lane OR foundation-kind, OR `--strict` is set on any lane, then the command exits 3 with the diagnostic content from REQ-...-01 plus a remediation hint pointing at `.claude/rules/tests.md` § Invariant 6f.
- [ ] REQ-0.0.23-05-04: Given an ADR whose `@covers` decorators predate their REQs' closing receipts by more than both thresholds, when `gz adr audit-check` runs, then no decorator is flagged (legitimate-evolution case passes).
- [ ] REQ-0.0.23-05-05: Given a missing or malformed `data/audit_thresholds.json`, when `gz adr audit-check` runs, then the command exits 1 with a diagnostic naming the file and the validation failure; the command MUST NOT silently fall back to compiled-in defaults at runtime.
- [ ] REQ-0.0.23-05-06: Given the threshold-config schema at `src/gzkit/schemas/audit_thresholds.json`, when the schema is loaded by the command, then it is a Pydantic `BaseModel` with `ConfigDict(frozen=True, extra="forbid")` per `.claude/rules/models.md`.
- [ ] REQ-0.0.23-05-07: Given a shallow clone or missing git object that prevents resolving an `@covers` decorator's introducing commit, when `gz adr audit-check` runs without `--strict`, then the command surfaces a diagnostic naming the unresolvable decorator and continues (skipping that decorator); when `--strict` is set, the command exits 2 (system error).
- [ ] REQ-0.0.23-05-08: Given the wrapper module, when its unit tests run, then every git-history call is mocked at the subprocess (or helper) boundary; no test reaches the live repository's git history.
- [ ] REQ-0.0.23-05-09: Given the BDD scenarios at `features/adr_audit_covers_backfill.feature`, when `gz validate --behave-req-tags` runs, then every REQ id above that drives a behave-coverable behavior carries a matching `@REQ-0.0.23-05-NN` scenario tag.
- [ ] REQ-0.0.23-05-10: Given the manpage update, when `gz cli audit` runs, then exit 0 with `--strict` covered across manpage, command doc, and index per `.claude/rules/cli.md` § Consistency.
- [ ] REQ-0.0.23-05-11: Given the unit-test additions, when ARB-wrapped Heavy-lane gates run (lint, typecheck, unittest, coverage, mkdocs, behave), then ARB receipts exist for each invocation and are cited in the closing attestation per `AGENTS.md` § Attestation.

## Completion Checklist

<!-- Verify all gates before marking OBPI accepted. -->

- [ ] **Gate 1 (ADR):** Intent recorded in brief
- [ ] **Gate 2 (TDD):** RGR cycle followed, tests derived from brief, coverage maintained
- [ ] **Code Quality:** Lint, format, type checks clean
- [ ] **Value Narrative:** Problem-before vs capability-now is documented
- [ ] **Key Proof:** One concrete usage example is included
- [ ] **OBPI Acceptance:** Evidence recorded below

> For ceremony steps and lane-inheritance attestation rules, see `AGENTS.md` section `OBPI Acceptance Protocol`.

## Evidence

<!-- Record observations during/after implementation.
     Command outputs, file:line references, dates. -->

### Gate 1 (ADR)

- [ ] Intent and scope recorded

### Gate 2 (TDD — Red-Green-Refactor)

```text
# Paste test output here
```

### Code Quality

```text
# Paste lint/format/type check output here
```

### Gate 3 (Docs)

```text
# Paste docs-build output here when Gate 3 applies
```

### Gate 4 (BDD)

```text
# Paste behave output here when Gate 4 applies
```

### Gate 5 (Human)

```text
# Record attestation text here when required by parent lane
```

### Value Narrative

<!-- What problem existed before this OBPI, and what capability exists now? -->

### Key Proof


End-to-end heavy-lane fail-closed witness via the BDD scenario:

```
$ uv run -m behave features/adr_audit_covers_backfill.feature
@REQ-0.0.23-05-09
Scenario: Heavy-lane same-commit backfill exits 3 with the remediation hint
  Given the workspace is initialized in heavy mode
  And the audit-thresholds file is present at "data/audit_thresholds.json"
  Given a heavy ADR with a same-commit @covers backfill exists for OBPI-0.1.0-01-demo
  When I run the gz command "adr audit-check ADR-0.1.0-f"
  Then the command exits with code 3
  And the output contains "covers-backfill finding"
  And the output contains "Invariant 6f"

1 scenario passed, 0 failed, 0 skipped
```

Heuristic mints (introducing commit, closing-receipt commit) pair from same git head; computes 0c/0d gap; severity=blocking under heavy/foundation; surfaces file:line + REQ + SHA + receipt + Invariant 6f remediation hint; SystemExit(3). ARB receipts cited inline: arb-ruff-1877b547d779490abd9f40f7036d681a (lint), arb-step-typecheck-193100ae9ae94d21a199446cc29ad426 (typecheck), arb-step-unittest-6b43396a525547e292f102ba00c61eda (3925 tests), arb-step-mkdocs-78510e16ef88496baed52e29a79bf3e5 (mkdocs strict), arb-step-behave-a9b082795e484dcead8570a6800db1c6 (145 BDD scenarios). gz cli audit 90/90; gz covers OBPI-0.0.23-05 11/11. Closes GHI #309.

### Implementation Summary


- Files created: src/gzkit/commands/adr_audit_covers_backfill.py (heuristic core, 574 lines), src/gzkit/schemas/audit_thresholds.json, data/audit_thresholds.json, tests/governance/test_audit_check_covers_backfill.py (45 tests), tests/fixtures/adr_audit_covers_backfill/{legitimate_evolution,same_commit_backfill}/ (fixture pair REQ-10), features/adr_audit_covers_backfill.feature + features/steps/adr_audit_covers_backfill_steps.py (@REQ-0.0.23-05-09), docs/user/manpages/gz-adr-audit-check.md
- Files modified: src/gzkit/commands/adr_audit.py (heuristic call-out + lane/kind derivation + render + exit-code precedence), src/gzkit/cli/parser_artifacts.py (--strict flag), src/gzkit/commands/init_cmd.py (production scaffolds data/audit_thresholds.json), tests/commands/common.py (_quick_init mirrors the scaffold), docs/user/commands/adr-audit-check.md (--strict + thresholds doc), docs/user/runbook.md (backfill-finding remediation flow)
- Tests added: 45 unit tests + 1 BDD scenario; full suite 3925 unittest + 145 BDD all green
- Date completed: 2026-05-02
- Attestation status: required (foundation × heavy × security three-axis OR — brief-level Gate 5)
- Defects noted: GHI #380 filed for the authoring-time governance vibing pattern surfaced during this OBPI's plan-audit

## Tracked Defects

<!-- Record GitHub defect linkage when defects are discovered during this OBPI.
     Use one bullet per issue so status surfaces can preserve traceability. -->

- GHI #309 — source brief; the body's prescribed work (temporal heuristic + threshold-config + heavy/foundation fail-closed + test fixtures) is the authoritative source for this brief's requirements. GHI remains open until this OBPI lands and the closing commit references both `OBPI-0.0.23-05` and `(GHI #309)`.
- GHI #272 — origin of the cosmetic-`@covers`-backfill anti-pattern this heuristic mechanizes. Already closed; cited here for context, not as a tracked defect of this OBPI.

## Human Attestation

- Attestor: `Jeffry Babb`
- Attestation: attest completed — REQ-0.0.23-05-01 through REQ-0.0.23-05-11 all covered (gz covers OBPI-0.0.23-05 → 11/11). Heavy-lane × foundation-kind × security-sensitivity three-axis attestation gates green via ARB receipts arb-ruff-1877b547d779490abd9f40f7036d681a, arb-step-typecheck-193100ae9ae94d21a199446cc29ad426, arb-step-unittest-6b43396a525547e292f102ba00c61eda (3925 tests pass), arb-step-mkdocs-78510e16ef88496baed52e29a79bf3e5 (strict docs build), arb-step-behave-a9b082795e484dcead8570a6800db1c6 (145 BDD scenarios incl. @REQ-0.0.23-05-09). CLI audit 90/90 cross-coverage clean. Closes GHI #309 by structurally closing the Skipped cheap verification cosmetic-@covers-backfill failure class at the gz adr audit-check surface; GHI #380 filed mid-flight for the authoring-time vibing pattern surfaced as root cause.
- Date: 2026-05-02

---

**Brief Status:** Completed

**Date Completed:** 2026-05-02

**Evidence Hash:** -
