S00-024: Record blocked task and remediation handoff

Changes: Preserve incomplete work and blocker metadata for S00-024. This checkpoint does not mark implementation accepted.
Validation: Session ended with status blocked.
Blocker: S00-024 cannot establish readiness for S00-020: official checksum retrieval fails with configured proxy DNS error and host Node/npm differ from accepted pins; no partial environment-access artifacts exist.

Task: S00-024
Agent: auto-ci-cd-988167c541cf
Role: ci-cd
Action: claim
Status: blocked

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

planning/tasks.json

@@ -1348,7 +1348,8 @@
         "S00-002",
         "S00-017",
         "S00-018",
-        "S00-019"
+        "S00-019",
+        "S00-026"
       ],
       "requirements": [],
       "scope": [
@@ -1431,6 +1432,61 @@
       ],
       "context_budget_chars": 48000
     },
+    {
+      "id": "S00-026",
+      "stage": "S00",
+      "kind": "blocker",
+      "root_task": "S00-003",
+      "blocker_depth": 3,
+      "unblocks": [
+        "S00-024"
+      ],
+      "role": "ci-cd",
+      "reviewer_role": "qa",
+      "title": "Provide approved access to the pinned Linux experiment artifacts",
+      "outcome": "One independently verified approved access path supplies authentic pinned Linux Node/npm and integrity-verifiable parent locked dependencies for S00-020.",
+      "depends_on": [
+        "S00-001",
+        "S00-002",
+        "S00-017",
+        "S00-018",
+        "S00-019"
+      ],
+      "requirements": [],
+      "scope": [
+        "experiments/0002-xmpp-library/environment-access/**"
+      ],
+      "inputs": [
+        "docs/WEB_PROFILE.md",
+        "docs/ARCHITECTURE.md",
+        "docs/CONTRACTS.md",
+        "docs/TESTING.md",
+        "roles/protocol.md",
+        "docs/decisions/README.md",
+        "state/blockers/S00-020.md",
+        "state/blockers/S00-024.md",
+        "state/blockers/S00-026.md"
+      ],
+      "spec_sections": [],
+      "ui_sections": [],
+      "steps": [
+        "Obtain environment-owner confirmation of restored approved HTTPS access or local authentic runtime/checksum/dependency artifact paths, without credentials in reports.",
+        "Verify Linux Node 24.21.0 vendor checksum material and executing Node 24.21.0/npm 11.19.0.",
+        "Install unchanged copies of parent manifest and lock only inside environment-access using npm ci with scripts disabled and TLS/integrity verification retained.",
+        "Record reproducible paths, checks and limits for independent review; leave original tasks unfinished."
+      ],
+      "acceptance": [
+        "Approved access or authentic local artifacts are available and documented without policy bypass.",
+        "Exact pinned Linux runtime executes and vendor checksum verification succeeds.",
+        "Unchanged copied parent lock installs with integrity enforced and Stanza 12.22.1 available; no stack/spec/lock change."
+      ],
+      "checks": [
+        "Repeat original official HTTPS retrieval or independently verify approved supplied artifact provenance/checksum.",
+        "Check exact node/npm versions and isolated locked npm ci with scripts disabled.",
+        "Verify source changes stay within environment-access and no TLS/proxy/engine bypass occurs."
+      ],
+      "context_budget_chars": 48000
+    },
     {
       "id": "S00-010",
       "stage": "S00",