S00-018: Approve bounded XML ingress after independent framing checks

Changes: Accept the isolated S00-018 ingress experiment and bounded ADR; record independent security findings and review handoff. Preserve all browser, live WSS, interoperability and production resource limitations.
Validation: Fresh-cache npm ci and all 55 integrated tests passed on Node 24.21.0/npm 11.19.0; six additional adversarial documents rejected before real JXT.parse with stale callback/fresh attempt checks. Verified ten dependency licenses/integrities, 340 unchanged Stanza files, upstream saxes license bytes and matching digests. Stock defects reproduced; make check passed 72 tooling tests. Initial getter-only tracing attempt failed and is recorded separately. Scope/whitespace inspected; no browser or live WSS test.

Task: S00-018
Agent: auto-security-64dc2d9fa232
Role: security
Action: review
Status: done

Task title: Validate bounded standalone XML ingress for the XMPP candidate

state/tasks.json

@@ -1,6 +1,6 @@
 {
   "schema_version": 1,
-  "revision": 45,
+  "revision": 46,
   "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-902594b44429",
+      "status": "todo",
+      "owner": null,
       "started_at": "2026-10-14T19:20:57+00:00",
-      "reason": "S00-003 cannot attest parser limits: Stanza 12.22.1 exposes no resource bounds and its persistent WebSocket parser accepts large/deep XML and reassembles incomplete documents across separate input messages.",
-      "updated_at": "2026-10-14T19:24:00+00:00",
-      "blocked_by": [
-        "S00-018"
-      ],
+      "reason": null,
+      "updated_at": "2026-10-14T19:35:55+00:00",
+      "blocked_by": [],
       "resume_status": "in_progress",
       "blocker_report": "state/blockers/S00-018.md",
       "handoff": "state/handoffs/S00-003.md",
-      "previous_owner": "auto-protocol-826aa6bc12ef",
+      "previous_owner": "auto-protocol-902594b44429",
       "resumed_after_blocker": true
     },
     "S00-004": {
@@ -1236,14 +1234,17 @@
       "completed_at": "2026-10-14T19:20:57+00:00"
     },
     "S00-018": {
-      "status": "review",
+      "status": "done",
       "owner": "auto-protocol-89fe6563092c",
       "external_wait": false,
       "reason": null,
       "started_at": "2026-10-14T19:24:01+00:00",
-      "updated_at": "2026-10-14T19:31:32+00:00",
+      "updated_at": "2026-10-14T19:35:55+00:00",
       "evidence": "state/evidence/S00-018-auto-protocol-89fe6563092c.md",
-      "handoff": "state/handoffs/S00-018.md"
+      "handoff": "state/handoffs/S00-018.md",
+      "reviewer": "auto-security-64dc2d9fa232",
+      "review_evidence": "state/evidence/S00-018-review.md",
+      "completed_at": "2026-10-14T19:35:55+00:00"
     }
   },
   "events": [
@@ -1825,6 +1826,27 @@
       "to": "review",
       "reason": null,
       "evidence": "state/evidence/S00-018-auto-protocol-89fe6563092c.md"
+    },
+    {
+      "revision": 46,
+      "at": "2026-10-14T19:35:55+00:00",
+      "action": "auto-unblock",
+      "task": "S00-003",
+      "resolved_by": "S00-018",
+      "to": "todo",
+      "fresh_agent_required": true
+    },
+    {
+      "revision": 46,
+      "at": "2026-10-14T19:35:55+00:00",
+      "action": "approve",
+      "task": "S00-018",
+      "agent": "auto-security-64dc2d9fa232",
+      "role": "security",
+      "from": "review",
+      "to": "done",
+      "reason": null,
+      "evidence": "state/evidence/S00-018-review.md"
     }
   ],
   "retired_agents": [