docs(10-03): complete report-signoff plan and close Phase 10

- Mark Phase 10 complete in ROADMAP.md (3/3 plans, 2026-04-13)
- Create 10-03-report-signoff-SUMMARY.md with attestation-gap closure note
- Update STATE.md: plan 10-03 complete, Phase 10 closed, next is phase 8 or 11
- REQUIREMENTS.md RTVAL-01..05 ticks already landed in 10-02 completion commit (idempotent)

.planning/phases/10-real-world-runtime-validation/10-03-report-signoff-SUMMARY.md

@@ -0,0 +1,87 @@
+---
+phase: 10-real-world-runtime-validation
+plan: 03
+subsystem: validation/reporting
+tags: [runtime-validation, sign-off, phase-closure, rtval]
+requirements: [RTVAL-05]
+dependency_graph:
+  requires: [10-01, 10-02]
+  provides: [signed-off RUNTIME-VALIDATION.md, Phase 10 closure]
+  affects: [.planning/REQUIREMENTS.md, .planning/ROADMAP.md, .planning/STATE.md]
+tech_stack:
+  added: []
+  patterns: [human sign-off checkpoint, attestation gap acknowledgement]
+key_files:
+  created:
+    - .planning/phases/10-real-world-runtime-validation/10-03-report-signoff-SUMMARY.md
+  modified:
+    - .planning/phases/10-real-world-runtime-validation/RUNTIME-VALIDATION.md
+    - .planning/ROADMAP.md
+    - .planning/REQUIREMENTS.md
+decisions:
+  - Phase 10 closed with RTVAL-02/03/04 as attestation-only PASSes (only RTVAL-01 artifact-backed); reviewer explicitly acknowledged the audit-trail gap at sign-off rather than blocking closure for a re-run.
+metrics:
+  completed_date: 2026-04-13
+---
+
+# Phase 10 Plan 03: Report Sign-off Summary
+
+Finalized RUNTIME-VALIDATION.md, obtained human sign-off with explicit attestation-gap acknowledgement, and flipped Phase 10 tracking docs to complete.
+
+## What Was Done
+
+### Task 1 — Finalize RUNTIME-VALIDATION.md report body
+Completed in the 10-02 → 10-03 handoff window: all RTVAL-01..04 sections carry concrete PASS/FAIL verdicts, evidence links, and notes; top-level Status was flipped to READY FOR SIGN-OFF by the prior agent.
+
+### Task 2 — Human review and sign-off (checkpoint)
+Reviewer Sébastien QUEROL read the report, acknowledged the attestation-only audit-trail gap for RTVAL-02/03/04, and signed off on 2026-04-13:
+
+- Top-level **Status:** flipped to `SIGNED OFF`
+- **Signed off by:** Sébastien QUEROL
+- **Signed off date:** 2026-04-13
+- All three sign-off checkboxes ticked `[x]`
+- Reviewer explicitly accepted that only RTVAL-01 is artifact-backed; RTVAL-02/03/04 rest on technician verbal attestation. Compensating controls listed in the report (known device, known tenant, single session, known-good generator) stand in for missing log/screenshot evidence.
+
+Commit: `5685fd9` — `docs(phase-10): human sign-off on RUNTIME-VALIDATION.md (attestation gap acknowledged)`
+
+### Task 3 — Tick requirements, mark Phase 10 complete
+- `.planning/REQUIREMENTS.md` already had RTVAL-01..05 ticked `[x]` and the Traceability table showing `Complete` for each (landed in the 10-02 completion commit `206648c`). Idempotent confirmation only — no edits needed.
+- `.planning/ROADMAP.md`:
+  - Phase 10 entry flipped from `[ ]` to `[x]` with `(completed 2026-04-13)` appended.
+  - Progress table row for Phase 10 set to `v1.1 | 3/3 | Complete | 2026-04-13`.
+
+## Verification
+
+- `grep "^\*\*Status:\*\* SIGNED OFF" RUNTIME-VALIDATION.md` → hit
+- `grep "Signed off by:\*\* Sébastien QUEROL" RUNTIME-VALIDATION.md` → hit
+- Zero `Status: PENDING` lines in the report
+- `grep "\[x\] \*\*RTVAL-05\*\*" REQUIREMENTS.md` → hit
+- `grep "\[x\] \*\*Phase 10" ROADMAP.md` → hit
+- ROADMAP.md Progress row for Phase 10 shows `3/3 | Complete | 2026-04-13`
+
+All verification checks from the plan pass.
+
+## Deviations from Plan
+
+None. Task 3 REQUIREMENTS.md edits were already present from plan 10-02's completion commit, making that step a no-op confirmation rather than a mutation. No deviation rules (1-4) triggered.
+
+## Phase 10 Closure Note — Attestation-Only Audit Trail
+
+Phase 10 closes with a structurally weakened runtime audit trail that downstream consumers must be aware of:
+
+- **RTVAL-01** (tenant ingestion): PASS, artifact-backed (screenshots + exact .intunewin package committed under `evidence/`), re-tested on the fixed build after ISSUE-01 was resolved (commits `74535ea` + `7716246`).
+- **RTVAL-02** (install under SYSTEM): PASS, **attestation-only** — no `IntuneManagementExtension.log` excerpt, no portal screenshot.
+- **RTVAL-03** (detection rule): PASS, **attestation-only, 2nd consecutive** — no portal screenshot, no manual detect transcript.
+- **RTVAL-04** (uninstall under SYSTEM): PASS, **attestation-only, 3rd consecutive** — no uninstall log, no portal screenshot.
+
+RTVAL-02/03/04 together form an attestation-only runtime half for the phase. The user was warned twice during plan 10-02 (on RTVAL-03 and again on RTVAL-04) that consecutive attestation-only checks damage the audit trail, and chose to proceed both times. At sign-off the user again explicitly acknowledged the gap and accepted Phase 10 closure on that basis.
+
+**Implication for future work:** If a regression, incident, or customer escalation touches SYSTEM-context install, detection, or uninstall, RTVAL-02/03/04 must be treated as soft PASSes — the "it worked once" claim for this build cannot be independently re-derived from evidence files and must be re-validated with full artifact capture. Phase 11 rollout proceeds at the reviewer's risk.
+
+## Self-Check: PASSED
+
+- FOUND: `.planning/phases/10-real-world-runtime-validation/RUNTIME-VALIDATION.md` (SIGNED OFF)
+- FOUND: `.planning/phases/10-real-world-runtime-validation/10-03-report-signoff-SUMMARY.md`
+- FOUND: REQUIREMENTS.md RTVAL-01..05 ticked + Traceability Complete
+- FOUND: ROADMAP.md Phase 10 ticked with 3/3 Complete 2026-04-13
+- FOUND commit: `5685fd9` (Task 2 sign-off)