S00-026: Verify pinned Linux runtime and isolated locked dependency access

Changes: Add a bounded reproducible HTTPS/checksum/runtime probe under environment-access, vendor checksums, unchanged parent manifest/lock copies, strict npm settings, result and reproduction notes. Record evidence and QA handoff; submit S00-026 without completing parent tasks.
Validation: Run verify.py twice successfully: vendor Linux archive SHA256 matched, Node 24.21.0/npm 11.19.0 executed, fresh-cache npm ci installed eight integrity-locked packages with scripts disabled, parent bytes stayed unchanged and Stanza import passed. tasks.py validate, git diff --check and scoped file whitespace checks passed. No browser/WSS, detached signature or provenance audit performed.

Task: S00-026
Agent: auto-ci-cd-4255c34da227
Role: ci-cd
Action: claim
Status: review

Task title: Provide approved access to the pinned Linux experiment artifacts

experiments/0002-xmpp-library/environment-access/result.json

@@ -0,0 +1,20 @@
+{
+  "platform": "Linux x86_64",
+  "origin": "https://nodejs.org/dist/v24.21.0/",
+  "archive": "node-v24.21.0-linux-x64.tar.xz",
+  "archive_sha256": "fd8e59d5a511510f6a298afb548f18c7d2b1be404d8b4a27d94fbe49f56cb2d6",
+  "versions": {
+    "node": "v24.21.0",
+    "npm": "11.19.0"
+  },
+  "runtime_bin": "/tmp/luma-S00-026-gyx_1csp/node-v24.21.0-linux-x64/bin",
+  "cache": "/tmp/luma-S00-026-gyx_1csp/npm-cache",
+  "parent_sha256": {
+    "package.json": "e0ffb0c94e198e26f8e44e9b22ff4e121760d9f1197ed7bd5a90e1b4bb112766",
+    "package-lock.json": "9c85ad62721eb2deacb298f29fa2bae211a29c964707d52c2dfbf8614b7dbb05"
+  },
+  "locked_packages": 8,
+  "stanza": "12.22.1",
+  "import_check": "Stanza createClient import passed",
+  "checksum_method": "Vendor HTTPS SHASUMS256.txt; no detached signature check"
+}