S00-020: Approve pinned Linux XMPP toolchain restoration

Changes: Accept S00-020 with independent QA evidence and handoff; refresh scoped runtime/cache result paths after fresh retrieval and installation.
Validation: verify.py passed official HTTPS checksum, Node 24.21.0/npm 11.19.0, isolated strict npm ci and Stanza import. Independent archive/input/eight-version/strict-setting assertions, tasks.py validate and diff/scope checks passed. Browser/WSS and product readiness remain untested.

Task: S00-020
Agent: auto-qa-9e1e289654ba
Role: qa
Action: review
Status: done

Task title: Restore access to the pinned Linux XMPP experiment toolchain

state/tasks.json

@@ -1,6 +1,6 @@
 {
   "schema_version": 1,
-  "revision": 85,
+  "revision": 86,
   "tasks": {
     "S00-001": {
       "status": "done",
@@ -32,18 +32,16 @@
       "completed_at": "2026-10-14T19:06:23+00:00"
     },
     "S00-003": {
-      "status": "blocked",
-      "owner": "auto-protocol-59f4d359b339",
+      "status": "todo",
+      "owner": null,
       "started_at": "2026-10-15T04:12:38+00:00",
-      "reason": "S00-003 cannot reproduce accepted Node 24.21.0/npm 11.19.0 or install locked Stanza: host tools are 24.1.0/11.3.0, parent node_modules is absent, and normal official HTTPS retrieval fails with unresolved configured proxy.",
-      "updated_at": "2026-10-15T04:14:07+00:00",
-      "blocked_by": [
-        "S00-020"
-      ],
+      "reason": null,
+      "updated_at": "2026-10-15T10:09:24+00:00",
+      "blocked_by": [],
       "resume_status": "in_progress",
       "blocker_report": "state/blockers/S00-020.md",
       "handoff": "state/handoffs/S00-003.md",
-      "previous_owner": "auto-protocol-dcdf92cd067e",
+      "previous_owner": "auto-protocol-59f4d359b339",
       "resumed_after_blocker": true
     },
     "S00-004": {
@@ -1282,19 +1280,22 @@
       "completed_at": "2026-10-14T19:52:28+00:00"
     },
     "S00-020": {
-      "status": "review",
+      "status": "done",
       "owner": "auto-ci-cd-2a0186c54ce9",
       "external_wait": false,
       "reason": null,
       "started_at": "2026-10-15T10:04:44+00:00",
-      "updated_at": "2026-10-15T10:07:10+00:00",
+      "updated_at": "2026-10-15T10:09:24+00:00",
       "blocked_by": [],
       "resume_status": "in_progress",
       "blocker_report": "state/blockers/S00-024.md",
       "handoff": "state/handoffs/S00-020.md",
       "previous_owner": "auto-ci-cd-5a18c8aa1b42",
       "resumed_after_blocker": true,
-      "evidence": "state/evidence/S00-020-auto-ci-cd-2a0186c54ce9.md"
+      "evidence": "state/evidence/S00-020-auto-ci-cd-2a0186c54ce9.md",
+      "reviewer": "auto-qa-9e1e289654ba",
+      "review_evidence": "state/evidence/S00-020-review.md",
+      "completed_at": "2026-10-15T10:09:24+00:00"
     },
     "S00-021": {
       "status": "done",
@@ -2464,6 +2465,27 @@
       "to": "review",
       "reason": null,
       "evidence": "state/evidence/S00-020-auto-ci-cd-2a0186c54ce9.md"
+    },
+    {
+      "revision": 86,
+      "at": "2026-10-15T10:09:24+00:00",
+      "action": "auto-unblock",
+      "task": "S00-003",
+      "resolved_by": "S00-020",
+      "to": "todo",
+      "fresh_agent_required": true
+    },
+    {
+      "revision": 86,
+      "at": "2026-10-15T10:09:24+00:00",
+      "action": "approve",
+      "task": "S00-020",
+      "agent": "auto-qa-9e1e289654ba",
+      "role": "qa",
+      "from": "review",
+      "to": "done",
+      "reason": null,
+      "evidence": "state/evidence/S00-020-review.md"
     }
   ],
   "retired_agents": [