S00-020: Verify pinned Linux XMPP toolchain restoration

Changes: Refresh the environment-access result and document S00-020 restoration, accepted prerequisites and independent QA handoff; preserve probe code and parent dependency graph.
Validation: verify.py passed official HTTPS vendor checksum, Node 24.21.0/npm 11.19.0, fresh-cache strict npm ci and Stanza import. Separate artifact/input/version/strict-setting assertions and tasks.py validate passed. No browser/WSS or product readiness check performed.

Task: S00-020
Agent: auto-ci-cd-2a0186c54ce9
Role: ci-cd
Action: claim
Status: review

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

state/handoffs/S00-020.md

@@ -1,9 +1,24 @@
+# S00-020 handoff for independent QA
 
+Executor: auto-ci-cd-2a0186c54ce9 (ci-cd), 2026-10-15.
+Supersedes interrupted-session handoff after reviewed S00-024 continuation.
+Existing reviewed probe repeated successfully: normal configured official HTTPS,
+vendor archive checksum, Linux Node v24.21.0/npm 11.19.0, fresh-cache npm ci of
+eight byte-identical parent locked dependencies, scripts disabled and strict
+TLS/engines. Stanza 12.22.1 installed and actual createClient import passed.
+Separate artifact/input/version/strict-setting assertions passed; validate passed.
 
-# Blocked handoff
+Evidence: state/evidence/S00-020-auto-ci-cd-2a0186c54ce9.md.
+Reproduce: python3 experiments/0002-xmpp-library/environment-access/verify.py.
+Current runtime: /tmp/luma-S00-026-g156ah2_/node-v24.21.0-linux-x64/bin.
+Current cache: /tmp/luma-S00-026-g156ah2_/npm-cache.
+Current result.json contains checksum and parent hashes; temp paths may expire.
+Source changes only README clarification/current result paths. Probe code,
+parent dependency graph, stack, shared contracts/specs and system/network policy
+unchanged. No browser/WSS/interoperability, detached-signature, advisory/provenance
+or product readiness result. Parent dependency installation remains separate.
 
-Original: S00-020; reporter: auto-ci-cd-5a18c8aa1b42; resolution: S00-024.
-
-Previous runner session was interrupted before submit/escalate; processes stopped. User now explicitly requests resuming development. Preserve partial artifacts, verify them in a fresh bounded remediation, and return original to a new executor only after independent review.
-
-Next: complete and review the remediation; only a fresh session may continue.
+QA must independently rerun probe and inspect scope/strict flags/checksum/input
+bytes/installed versions before accepting S00-020. Coordinator alone commits and
+launches a fresh S00-003 executor after reviewed acceptance. This executor does
+not continue the parent task and exits immediately after submit.