diff --git a/.github/workflows/strix.yml b/.github/workflows/strix.yml
index ef0966cf4d..51c56b381c 100644
--- a/.github/workflows/strix.yml
+++ b/.github/workflows/strix.yml
@@ -130,7 +130,7 @@ jobs:
     # docs/doctoring/required-workflow-path-filter-boundary.md.
     # Fails OPEN: an unreadable, empty, or truncated file list scans everything.
     if: github.event_name != 'pull_request_target' || (github.event.action != 'closed' && github.event.action != 'converted_to_draft')
-    runs-on: ubuntu-24.04
+    runs-on: ${{ (github.repository == 'ContextualWisdomLab/.github' || github.repository == 'ContextualWisdomLab/fast-mlsirm') && github.workflow_ref == 'ContextualWisdomLab/.github/.github/workflows/strix.yml@refs/heads/main' && fromJSON('{"group":"CWL central control","labels":["self-hosted","linux","x64","cwlab-control"]}') || fromJSON('["ubuntu-24.04"]') }}
     timeout-minutes: 5
     permissions:
       contents: read
@@ -187,7 +187,7 @@ jobs:
     if: >-
       github.event_name != 'pull_request_target' ||
       (github.event.action != 'closed' && github.event.action != 'converted_to_draft')
-    runs-on: ubuntu-24.04
+    runs-on: ${{ (github.repository == 'ContextualWisdomLab/.github' || github.repository == 'ContextualWisdomLab/fast-mlsirm') && github.workflow_ref == 'ContextualWisdomLab/.github/.github/workflows/strix.yml@refs/heads/main' && fromJSON('{"group":"CWL central control","labels":["self-hosted","linux","x64","cwlab-control"]}') || fromJSON('["ubuntu-24.04"]') }}
     timeout-minutes: 5
     permissions:
       contents: read
@@ -260,7 +260,7 @@ jobs:
         github.event.pull_request.base.repo.full_name || github.repository }}-${{
         github.event.pull_request.number || github.run_id }}
       cancel-in-progress: true
-    runs-on: ubuntu-24.04
+    runs-on: ${{ (github.repository == 'ContextualWisdomLab/.github' || github.repository == 'ContextualWisdomLab/fast-mlsirm') && github.workflow_ref == 'ContextualWisdomLab/.github/.github/workflows/strix.yml@refs/heads/main' && fromJSON('{"group":"CWL central control","labels":["self-hosted","linux","x64","cwlab-control"]}') || fromJSON('["ubuntu-24.04"]') }}
     # Bound this gh-api-only cleanup job so a stuck call (rate limit, hung
     # `gh api --paginate`) cannot silently occupy a runner for GitHub's
     # 360-minute platform default -- exactly the window when a busy PR is
@@ -1172,7 +1172,7 @@ jobs:
     name: publish-manual-pr-evidence-status
     needs: strix
     if: ${{ always() && !cancelled() && github.event_name == 'repository_dispatch' && github.event.client_payload.pr_head_sha != '' }}
-    runs-on: ubuntu-24.04
+    runs-on: ${{ (github.repository == 'ContextualWisdomLab/.github' || github.repository == 'ContextualWisdomLab/fast-mlsirm') && github.workflow_ref == 'ContextualWisdomLab/.github/.github/workflows/strix.yml@refs/heads/main' && fromJSON('{"group":"CWL central control","labels":["self-hosted","linux","x64","cwlab-control"]}') || fromJSON('["ubuntu-24.04"]') }}
     # Single-shot OIDC exchange plus a handful of curl/gh api calls, no loop
     # or pagination -- same shape as the agent-mention-*-dispatch.yml
     # validate-and-forward jobs, which bound at timeout-minutes: 5. Without
diff --git a/docs/doctoring/central-dedicated-runner-routing-20260927.md b/docs/doctoring/central-dedicated-runner-routing-20260927.md
index c79175ac7d..aa84465589 100644
--- a/docs/doctoring/central-dedicated-runner-routing-20260927.md
+++ b/docs/doctoring/central-dedicated-runner-routing-20260927.md
@@ -109,3 +109,25 @@ capacity or independent service-time measurement justifies another solver.
 The routing regression fails against the unchanged baseline. Workflow syntax
 and affected contracts passed: 238 passed, 2 skipped with `GITHUB_ACTIONS=true`;
 `actionlint` and `git diff --check` passed.
+
+
+## fast-mlsirm Strix control admission
+
+Current fast-mlsirm PR #2220 head `4eaeb799a6647ea29f3f4902d9ca79a1377e795c`
+queued Strix admission job `108617323217` with `ubuntu-24.04`, despite the
+self-hosted rollout. Route only changed-scope, current-head admission,
+superseded-run cleanup and manual status publication through group 6 when
+the source is exactly central `strix.yml@refs/heads/main` and the caller is
+the central repository or fast-mlsirm. These jobs do not check out PR code.
+The model scan keeps its existing hosted image and all evidence, credentials,
+fork handling and live-head validation remain intact.
+
+Reuse the deployed allocation; no new service-time or capacity measurement
+justifies a different solver result. Deployment requires adding only central
+`strix.yml@refs/heads/main` to group 6's selected workflows, preserving all
+existing restrictions and grants. Old queued jobs keep their original source.
+
+The routing test failed on the unmodified workflow. The affected runner,
+changed-scope and dependency-hash tests passed (21 tests); actionlint and
+diff whitespace checks passed. This is local source proof, not completed
+consumer gate evidence.
diff --git a/tests/test_docs_only_pr_runner_admission.py b/tests/test_docs_only_pr_runner_admission.py
index 6a1908e6f8..a0f691e2a2 100644
--- a/tests/test_docs_only_pr_runner_admission.py
+++ b/tests/test_docs_only_pr_runner_admission.py
@@ -93,12 +93,12 @@ def test_gate_job_is_byte_identical_across_the_five_workflows_apart_from_if():
         workflow = _read(filename)
         block = _top_level_job_block(workflow, "changed-scope")
         normalized = "\n".join(
-            line for line in block.splitlines() if not line.strip().startswith("if:")
+            line for line in block.splitlines() if not line.strip().startswith(("if:", "runs-on:"))
         )
         normalized_blocks.add(normalized)
     assert len(normalized_blocks) == 1, (
         "changed-scope gate copies drifted; keep them byte-identical apart "
-        "from the single 'if:' line"
+        "from the event guard and separately tested runner allocation"
     )
 
 
@@ -132,9 +132,9 @@ def test_gate_jobs_use_supported_runner_allocation():
     """Scope jobs preserve trusted-main routing and a supported hosted fallback."""
     for filename in GATE_WORKFLOWS:
         block = _top_level_job_block(_read(filename), "changed-scope")
-        if filename == "opencode-review.yml":
+        if filename in ("opencode-review.yml", "strix.yml"):
             assert '"group":"CWL central control"' in block, filename
-            assert "github.workflow_ref == 'ContextualWisdomLab/.github/.github/workflows/opencode-review.yml@refs/heads/main'" in block, filename
+            assert f"github.workflow_ref == 'ContextualWisdomLab/.github/.github/workflows/{filename}@refs/heads/main'" in block, filename
             assert "fromJSON('[\"ubuntu-24.04\"]')" in block, filename
         elif filename == "noema-review.yml":
             assert "endsWith(github.workflow_ref, '@refs/heads/main')" in block, filename
diff --git a/tests/test_required_review_runner_image_contract.py b/tests/test_required_review_runner_image_contract.py
index 991c97d703..4a800219b2 100644
--- a/tests/test_required_review_runner_image_contract.py
+++ b/tests/test_required_review_runner_image_contract.py
@@ -27,8 +27,20 @@ def assert_explicit_supported_image(self, path: Path) -> None:
         self.assertEqual(runs_on, {"runs-on: ubuntu-24.04"})
 
     def test_strix_uses_explicit_supported_image(self) -> None:
-        """Require every Strix job to use explicit Ubuntu 24.04."""
-        self.assert_explicit_supported_image(STRIX)
+        """Route trusted metadata to control while preserving the scan image."""
+        workflow = STRIX.read_text(encoding="utf-8")
+        for name in ("changed-scope", "admit-current-head", "cancel-superseded-pr-runs", "publish-manual-pr-evidence-status"):
+            block = re.split(r"\n  [a-z][a-z-]*:\n", workflow.split(f"\n  {name}:\n", 1)[1], maxsplit=1)[0]
+            self.assertIn('"group":"CWL central control"', block)
+            self.assertIn('"labels":["self-hosted","linux","x64","cwlab-control"]', block)
+            self.assertIn("github.workflow_ref == 'ContextualWisdomLab/.github/.github/workflows/strix.yml@refs/heads/main'", block)
+            self.assertIn("github.repository == 'ContextualWisdomLab/.github'", block)
+            self.assertIn("github.repository == 'ContextualWisdomLab/fast-mlsirm'", block)
+            self.assertIn("fromJSON('[\"ubuntu-24.04\"]')", block)
+            self.assertNotIn("actions/checkout", block)
+        scan = workflow.split("\n  strix:\n", 1)[1].split("\n  publish-manual-pr-evidence-status:\n", 1)[0]
+        self.assertIn("runs-on: ubuntu-24.04", scan)
+        self.assertNotIn("cwlab-control", scan)
 
     def test_opencode_review_uses_explicit_supported_image(self) -> None:
         """Keep metadata-only OpenCode admission on the trusted control pool."""