docs: record Phase 9 rig qualification

docs/screenshare-audio-exclusion-impl-plan.md

@@ -24,10 +24,10 @@ built, validated and committed locally in PixelPass (`e027bc6`), completing Phas
 **Phase 7's public selector, AEC wiring and versioned capability response are built, validated
 and committed locally in PixelPass (`792f2bd`).** **Phase 8's PeerSpeak capability negotiation,
 picker/argv integration and causal status surface are built, validated and committed locally
-(`2c2b861`).** **Phase 9's PN correlation/xrun rig is implemented and non-live validated locally
-in PixelPass (`98bb78f`); its controlled live run and the field matrix remain open, and nothing
-has been released. Phase 9 is still the current front and ship gate.**
-**Date:** 2026-07-21 (v4); status line refreshed 2026-08-21
+(`2c2b861`).** **Phase 9's PN correlation/xrun rig is implemented and live-qualified locally in
+PixelPass (`98bb78f`, hardened by `360d711`); the field matrix remains open, and nothing has
+been released. Phase 9 is still the current front and ship gate.**
+**Date:** 2026-07-21 (v4); status line refreshed 2026-08-22
 **Design of record:** [`screenshare-audio-exclusion-plan.md`](screenshare-audio-exclusion-plan.md) v3.8, round 11.
 **Scope:** *ordering, gates and acceptance criteria only.*
 
@@ -1019,14 +1019,25 @@ gross-leak distinction, in v3.4 §9.2's exact wording.
 > teardown/residue and audio-health gates.
 >
 > Thresholds are fixed in the ignored live test before any arm runs: present correlation ≥ 0.25,
-> excluded correlation ≤ 0.20, and zero new xruns. The pure probe-orthogonality/phase test, all
-> 355 non-live tests (14 live-only ignored), formatting, diff checks, and strict all-target Clippy
-> pass. The live three-arm test has **not** fired: an already-running PeerSpeak instance owned an
-> echo-cancel module, and the test correctly refused to mutate the shared audio graph. After
-> PeerSpeak is closed, run it alone from PixelPass with
-> `cargo test -j 1 host::audio_plan::tests::live_phase9_three_arm_pn_correlation_measurement -- --ignored --exact --nocapture --test-threads=1`;
-> until that passes, the rig upgrade is not qualified and Phase 9 remains open. The
-> two-machine/real-path matrix below remains open regardless of that result.
+> excluded correlation ≤ 0.20, and zero new xruns.
+>
+> **Controlled live qualification PASSED on 2026-08-22; harness hardening committed as PixelPass
+> `360d711`.** The first two safe attempts exposed assumptions in the new rig before they could
+> hide field variance: PipeWire returned five matching IDs for four requested node names, proving
+> again that `node.name` is not unique, and cold `parec` startup yielded too little audio for three
+> windows. The resolver now requires every requested name while monitoring all matching IDs, with
+> a duplicate/missing-name regression test. Phase 9 alone records for six seconds from twelve-second
+> probes; the proven Phase 6 recorder remains at three seconds and its behavior is unchanged.
+>
+> The final serialized run produced seven complete windows per channel in every arm. The absent
+> remote-probe maximum was 0.1356 in control and 0.1340 when guarded, both below 0.20. The naive
+> positive-control remote minimum was 0.5741, and the eligible desktop minimum across all arms was
+> 0.6429, both above 0.25. Every arm added zero xruns. Original playback and exact capture routes
+> remained intact, and the final module/sink/link/process/temp-file residue scan was empty. Full
+> validation passes 356 non-live tests with 14 live-only ignored, strict all-target Clippy,
+> formatting, diff checks, and `pixelpass --doctor`. Nix was unavailable, so the run used system
+> Rust 1.96.1 with one build job. **The rig upgrade is qualified; the two-machine/real-path matrix
+> below remains open and keeps the Phase 9 ship gate closed.**
 
 **Every row gets a declared pass/fail threshold before the run, not after.** Baseline for all
 rows: excluded probe ≤ the declared rig criterion; **eligible control audio present**; original