---
phase: 08-nyquist-validation-track
plan: 04
subsystem: validation-audit
tags: [nyquist, audit, phase-4, script-generation, validation, attestation-gap]
requires:
  - phase: 08-03
    provides: "Phase 3 Nyquist Record pattern + historical-gap closure methodology"
provides:
  - "Phase 4 Nyquist Record (5 rows, all pass) in .planning/phases/04-script-generation/04-VALIDATION.md"
  - "Phase 4 nyquist_compliant=true audited 2026-04-13"
  - "Faithful recording of Phase 10 RTVAL-02/03/04 attestation-only audit-trail damage as Notes on SYSTEM-context rows (no hiding, no upgrade to fail-fix)"
affects:
  - .planning/phases/04-script-generation/04-VALIDATION.md
tech_stack:
  added: []
  patterns:
    - "Nyquist Record audit table reused from 08-01/02/03: # | Criterion | Observable Check | Evidence | Status | Notes"
    - "Attestation-gap citation pattern: pass row + explicit Notes clause citing STATE.md 2026-04-13 + RTVAL-02/03/04"
key_files:
  created:
    - .planning/phases/08-nyquist-validation-track/08-04-SUMMARY.md
  modified:
    - .planning/phases/04-script-generation/04-VALIDATION.md
decisions:
  - "Derived 5 rows: one per SCRPT-0x success criterion from v1.0-ROADMAP.md Phase 4 (SCRPT-01..05). No extra historical-gap rows — Phase 4 shipped with 12/12 truths VERIFIED in 04-VERIFICATION.md and no kickoff-surfaced defects of its own."
  - "All 5 rows pass because Phase 10 signed off the runtime half with explicit attestation-gap acknowledgement (plan 10-03 commit cd2df1e). Per plan 08-04 directive, audit faithfully records the weakened audit trail in Notes rather than inflating to fail-fix-v1.1 — this mirrors the locked decision in STATE.md and the user's explicit approval of the attestation pattern."
  - "Rows 1/2/3 (SCRPT-01/02/03) each cite Phase 10 RTVAL-02/03/04 respectively, with Notes explicitly stating 'attestation-only per STATE.md 2026-04-13' and naming the missing artifacts (IntuneManagementExtension.log excerpt, rtval-03-detection.png, rtval-04-uninstall-log.txt, rtval-04-uninstall-status.png)."
  - "Row 4 (SCRPT-04 UAC) scoped narrowly: the SYSTEM-branch (skip elevation) was exercised in RTVAL-02 attestation-only; the user-interactive UAC dialog branch is NOT covered by Phase 10 at all and remains a Manual-Only Verification. Notes state this delineation explicitly."
  - "Row 5 (SCRPT-05 WOW64) recorded pass with Note that the relaunch branch itself is not directly observable from the RTVAL-02 attestation (technician only attested install succeeded, not that SysNative relaunch was taken). Template-level positional correctness (guard before pnputil) is fully pytest-automated. Phase 11 rollout owns the full WOW64 trace."
  - "No historical-gap bonus rows (unlike 08-02 row 6 drivers/upload 500). Phase 4 had no kickoff-surfaced defects beyond its own SCRPT-0x criteria."
metrics:
  tasks_completed: 1
  tasks_total: 1
  duration_minutes: 7
  completed_date: 2026-04-13
requirements_completed: []
---

# Phase 08 Plan 04: Phase 4 Nyquist Audit Summary

**One-liner:** Audited Phase 4 (Script Generation, SCRPT-01..05) against Nyquist rules and upgraded `04-VALIDATION.md` in place with a 5-row Nyquist Record where every SCRPT-0x criterion maps to exactly one observable check, with all three Phase 10 attestation-only RTVAL checks (RTVAL-02/03/04) faithfully recorded in the Notes column as weakened-audit-trail PASSes per STATE.md 2026-04-13.

## What Shipped

- `.planning/phases/04-script-generation/04-VALIDATION.md` now contains a `## Nyquist Record` section (placed above Validation Sign-Off, below Manual-Only Verifications).
- 5 rows: one per SCRPT-0x success criterion from `milestones/v1.0-ROADMAP.md` Phase 4 goal block.
- Every row has a non-empty Observable Check (pytest invocation) and a non-empty Evidence cell citing committed tests, source paths, commit SHAs, 04-VERIFICATION.md truths, and — for SYSTEM-context rows — Phase 10 `RUNTIME-VALIDATION.md` with explicit RTVAL sub-check names.
- **Attestation gap is faithfully recorded, not hidden.** A preamble paragraph above the table states: "Phase 10 RTVAL-02/03/04 were accepted as attestation-only PASSes — the technician verbally confirmed success but did not produce IntuneManagementExtension.log excerpts, portal screenshots, or status captures. The user was warned twice about cumulative audit-trail damage and explicitly approved proceeding." Each affected row's Notes column repeats the caveat in context.
- Frontmatter updated: `nyquist_compliant: false -> true`, added `nyquist_audited: 2026-04-13`, `nyquist_auditor: Claude (gsd-executor, plan 08-04)`.
- All historical sections (Test Infrastructure, Sampling Rate, Per-Task Verification Map, Wave 0 Requirements, Manual-Only Verifications, Validation Sign-Off) preserved verbatim.

## Audit Outcome

| Status        | Count |
|---------------|-------|
| pass          | 5     |
| fail-fix-v1.1 | 0     |
| deferred-v1.2 | 0     |
| wont-do       | 0     |

Phase 4 is Nyquist-compliant at the template level. The runtime-half weakness (SYSTEM-context proof via attestation only) is recorded in Notes and owned by Phase 11 rollout for artifact re-capture.

## Evidence Strategy Used

Priority order from CONTEXT.md was honored:
1. **Test evidence** (preferred): 5/5 rows cite `tests/test_script_generator.py` invocations — `test_render_install_contains_pnputil`, `test_render_install_print_config`, `test_install_endpoint`, `test_render_uninstall`, `test_uninstall_endpoint`, `test_render_detect`, `test_detect_endpoint`, `test_render_install_uac_guard`, `test_render_install_wow64_guard`. All 14 script-generator tests passed in 04-VERIFICATION.md.
2. **Commit/file-line evidence**: `imptune/templates/scripts/install.ps1.j2` (lines 12-16 WOW64, 22-33 UAC, 40-67 pnputil+print-config), `uninstall.ps1.j2` (lines 2-4), `detect.ps1.j2` (lines 2-8), `imptune/generators/script_generator.py` (`_duplex_map`, `render_install`, `render_uninstall` line 70, `render_detect` line 92), `imptune/api/scripts.py` (lines 38-59 install, 63-78 uninstall, 82-94 detect). Commits cited: b4f2c64 (04-01 RED), 8193e9d (04-01 GREEN), 6bff8f3 (04-02 templates + render fns), b7b0d1b (04-02 API endpoints).
3. **Dated manual-check evidence**: 04-VERIFICATION.md (2026-04-10, 12/12 truths VERIFIED) referenced per-row for cross-traceability.
4. **Runtime evidence (attestation-weakened)**: Phase 10 `RUNTIME-VALIDATION.md` cited on rows 1/2/3/4/5 for SYSTEM-context RTVAL-02/03/04 sub-checks — always with the attestation-only caveat named in Notes.

No row relied on "code looks right" — every check is an actual pytest invocation plus a cited runtime report.

## Cross-Reference with 04-VERIFICATION.md

`04-VERIFICATION.md` (dated 2026-04-10) enumerated 12 observable truths covering SCRPT-01..05. The Nyquist Record collapses these to 5 rows (one per criterion) as follows:

- Row 1 (SCRPT-01) <- truths 1 (pnputil+cmdlets), 4 (duplex mapping), 5 (idempotency), 8 (install endpoint)
- Row 2 (SCRPT-02) <- truths 6 (Remove-* ordering), 9 (uninstall endpoint)
- Row 3 (SCRPT-03) <- truths 7 (Write-Output+exit), 10 (detect endpoint)
- Row 4 (SCRPT-04) <- truth 3 (SYSTEM vs user + UAC)
- Row 5 (SCRPT-05) <- truth 2 (WOW64 positional guard)

Truths 11 + 12 (404/422 error paths) are cross-cutting and not SCRPT-0x criteria; they're covered as part of rows 1/2/3 evidence without needing their own Nyquist rows.

## Attestation-Gap Recording (Key Point for 08-08 Rollup)

Per STATE.md 2026-04-13 and plan 08-04 directive, this audit records the Phase 10 attestation-only audit-trail damage **in place** rather than hiding it or upgrading rows to `fail-fix-v1.1`:

- **RTVAL-02** (install on real endpoint) → cited on rows 1 (SCRPT-01 pnputil) + 4 (SCRPT-04 SYSTEM branch) + 5 (SCRPT-05 WOW64 end-to-end). Missing artifacts named: IntuneManagementExtension.log excerpt, portal screenshot.
- **RTVAL-03** (detection on real endpoint) → cited on row 3 (SCRPT-03). Missing artifacts named: rtval-03-detection.png, rtval-03-detect-manual.txt. Notes call out "second consecutive attestation-only check".
- **RTVAL-04** (uninstall on real endpoint) → cited on row 2 (SCRPT-02). Missing artifacts named: rtval-04-uninstall-log.txt, rtval-04-uninstall-status.png. Notes call out "third consecutive attestation-only check".

The preamble above the table also states the overall attestation-gap framing so that 08-08 rollup and any downstream verifier sees the weakness at a glance rather than having to reconstruct it from individual rows.

Status remained `pass` for all five rows because Phase 10 plan 10-03 (commit cd2df1e) signed off RUNTIME-VALIDATION.md with explicit written acknowledgement of the attestation gap — i.e., the user made an informed decision and the audit must honor it, not overrule it post-hoc. Phase 11 rollout owns artifact re-capture before broad deployment.

## Deviations from Plan

**None.** Plan 08-04 executed exactly as written. Single task, single file edit. The plan explicitly instructed: "Status may still be `pass` since Phase 10 signed off with explicit acknowledgement, but Notes must say 'attestation-only per STATE.md 2026-04-13'." — done on every affected row.

No Rule 1-4 deviations triggered. No auth gates.

## Authentication Gates

None.

## Self-Check: PASSED

- `.planning/phases/04-script-generation/04-VALIDATION.md` — FOUND (modified)
- `## Nyquist Record` heading — FOUND in file (grep returned 1 match)
- `nyquist_audited:` frontmatter key — FOUND in file
- `attestation-only per STATE.md 2026-04-13` language — FOUND on rows 1/2/3/4/5 Notes columns
- Commit `60654af` — FOUND in `git log`
- No source code files touched (plan constraint) — only `.planning/phases/04-script-generation/04-VALIDATION.md` modified