diff --git a/.github/workflows/canary.yml b/.github/workflows/canary.yml
index 6ede163..b869565 100644
--- a/.github/workflows/canary.yml
+++ b/.github/workflows/canary.yml
@@ -1,15 +1,10 @@
 name: Canary — plugin vs Codex main
 
 # Codex main moves fast and ships a prerelease cut (@alpha) near-daily, so the
-# host can break us even when we don't push. Run the host-interface contract
-# tests against the freshest main prerelease twice a day and alert on failure.
-# The live channel suite chains off this run, so the canary leads and live
-# follows on the same cadence.
+# host can break us even when we don't push. This reusable check exercises the
+# host interface against the freshest main prerelease before full-stack suites.
 on:
-  schedule:
-    # 2x/day at 6 AM and 6 PM America/Los_Angeles (PDT/UTC-7 basis; cron is UTC).
-    - cron: "13 13 * * *"   # 06:13 PT
-    - cron: "13 1 * * *"    # 18:13 PT
+  workflow_call:
   workflow_dispatch: {}
 
 permissions:
@@ -46,19 +41,3 @@ jobs:
       # only after this latest-host canary succeeds.
       - name: Full offline suite vs real Codex
         run: pytest -q
-
-  notify:
-    needs: canary
-    if: always() && github.event_name == 'schedule' && needs.canary.result != 'success'
-    runs-on: ubuntu-latest
-    timeout-minutes: 2
-    steps:
-      - name: Notify Google Chat
-        env:
-          WEBHOOK_URL: ${{ secrets.GOOGLE_CHAT_WEBHOOK_URL }}
-        run: |
-          [ -n "$WEBHOOK_URL" ] || { echo "GOOGLE_CHAT_WEBHOOK_URL is missing"; exit 1; }
-          curl --fail-with-body --retry 3 --retry-all-errors --max-time 20 \
-            -sS -X POST -H 'Content-Type: application/json' \
-            -d "{\"text\": \"🚨 codex-plugin canary FAILED against Codex main: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}\"}" \
-            "$WEBHOOK_URL"
diff --git a/.github/workflows/live-stack.yml b/.github/workflows/live-stack.yml
index 14d9fe6..e8a5617 100644
--- a/.github/workflows/live-stack.yml
+++ b/.github/workflows/live-stack.yml
@@ -1,12 +1,12 @@
 name: Full stack e2e
 
 on:
+  schedule:
+    - cron: "13 13 * * *"
+    - cron: "13 1 * * *"
   pull_request:
     types: [opened, synchronize, reopened, ready_for_review]
   workflow_dispatch:
-  workflow_run:
-    workflows: ["Canary — plugin vs Codex main"]
-    types: [completed]
 
 concurrency:
   group: inkbox-live-aut-tunnel
@@ -14,15 +14,24 @@ concurrency:
   queue: max
 
 jobs:
-  channels:
+  canary:
     if: >
+      github.event_name == 'schedule' ||
+      github.event_name == 'workflow_dispatch' ||
       (github.event_name == 'pull_request' &&
+       github.event.pull_request.draft == false &&
+       github.event.pull_request.head.repo.full_name == github.repository)
+    uses: ./.github/workflows/canary.yml
+
+  channels:
+    needs: canary
+    if: >
+      !cancelled() && needs.canary.result == 'success' &&
+      ((github.event_name == 'pull_request' &&
        github.event.pull_request.draft == false &&
        github.event.pull_request.head.repo.full_name == github.repository) ||
       github.event_name == 'workflow_dispatch' ||
-      (github.event_name == 'workflow_run' &&
-       github.event.workflow_run.conclusion == 'success' &&
-       github.event.workflow_run.head_branch == 'main')
+      github.event_name == 'schedule')
     uses: ./.github/workflows/live-channels.yml
     with:
       orchestrated: true
@@ -36,9 +45,7 @@ jobs:
         github.event.pull_request.draft == false &&
         github.event.pull_request.head.repo.full_name == github.repository) ||
        github.event_name == 'workflow_dispatch' ||
-       (github.event_name == 'workflow_run' &&
-        github.event.workflow_run.conclusion == 'success' &&
-        github.event.workflow_run.head_branch == 'main'))
+       github.event_name == 'schedule')
     uses: ./.github/workflows/live-a2a.yml
     with:
       orchestrated: true
@@ -52,9 +59,7 @@ jobs:
         github.event.pull_request.draft == false &&
         github.event.pull_request.head.repo.full_name == github.repository) ||
        github.event_name == 'workflow_dispatch' ||
-       (github.event_name == 'workflow_run' &&
-        github.event.workflow_run.conclusion == 'success' &&
-        github.event.workflow_run.head_branch == 'main'))
+       github.event_name == 'schedule')
     uses: ./.github/workflows/live-voice.yml
     with:
       orchestrated: true
@@ -71,9 +76,7 @@ jobs:
         github.event.pull_request.draft == false &&
         github.event.pull_request.head.repo.full_name == github.repository) ||
        github.event_name == 'workflow_dispatch' ||
-       (github.event_name == 'workflow_run' &&
-        github.event.workflow_run.conclusion == 'success' &&
-        github.event.workflow_run.head_branch == 'main'))
+       github.event_name == 'schedule')
     uses: ./.github/workflows/live-external-events.yml
     with:
       orchestrated: true
@@ -88,9 +91,7 @@ jobs:
         github.event.pull_request.draft == false &&
         github.event.pull_request.head.repo.full_name == github.repository) ||
        github.event_name == 'workflow_dispatch' ||
-       (github.event_name == 'workflow_run' &&
-        github.event.workflow_run.conclusion == 'success' &&
-        github.event.workflow_run.head_branch == 'main'))
+       github.event_name == 'schedule')
     runs-on: ubuntu-latest
     steps:
       - name: Require every live suite to pass
@@ -108,29 +109,3 @@ jobs:
             if [ "$result" != "success" ]; then failed=1; fi
           done
           exit "$failed"
-
-  notify:
-    needs: [channels, a2a, voice, external-events, full-stack]
-    if: >
-      always() &&
-      github.event_name == 'workflow_run' &&
-      github.event.workflow_run.event == 'schedule' &&
-      github.event.workflow_run.conclusion == 'success' &&
-      github.event.workflow_run.head_branch == 'main' &&
-      (needs.channels.result != 'success' ||
-       needs.a2a.result != 'success' ||
-       needs.voice.result != 'success' ||
-       needs.external-events.result != 'success' ||
-       needs.full-stack.result != 'success')
-    runs-on: ubuntu-latest
-    timeout-minutes: 2
-    steps:
-      - name: Notify Google Chat
-        env:
-          WEBHOOK_URL: ${{ secrets.GOOGLE_CHAT_WEBHOOK_URL }}
-        run: |
-          [ -n "$WEBHOOK_URL" ] || { echo "GOOGLE_CHAT_WEBHOOK_URL is missing"; exit 1; }
-          curl --fail-with-body --retry 3 --retry-all-errors --max-time 20 \
-            -sS -X POST -H 'Content-Type: application/json' \
-            -d "{\"text\": \"🚨 codex-plugin full-stack e2e FAILED (chained off the canary): ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}\"}" \
-            "$WEBHOOK_URL"
diff --git a/.github/workflows/scheduled-failure-report.yml b/.github/workflows/scheduled-failure-report.yml
new file mode 100644
index 0000000..e0ce3ca
--- /dev/null
+++ b/.github/workflows/scheduled-failure-report.yml
@@ -0,0 +1,64 @@
+name: Scheduled failure reporting
+
+on:
+  workflow_run:
+    workflows: ["Full stack e2e"]
+    types: [completed]
+
+permissions:
+  actions: read
+
+jobs:
+  report:
+    if: >-
+      ${{
+        github.event.workflow_run.event == 'schedule' &&
+        (
+          github.event.workflow_run.conclusion == 'failure' ||
+          github.event.workflow_run.conclusion == 'timed_out' ||
+          github.event.workflow_run.conclusion == 'startup_failure'
+        )
+      }}
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - name: Post failure notification
+        env:
+          NOTIFICATION_URL: ${{ secrets.SCHEDULED_FAILURE_NOTIFICATION_URL }}
+          REPOSITORY: ${{ github.repository }}
+          WORKFLOW_NAME: ${{ github.event.workflow_run.name }}
+          RUN_ID: ${{ github.event.workflow_run.id }}
+          RUN_ATTEMPT: ${{ github.event.workflow_run.run_attempt }}
+          RUN_URL: ${{ github.event.workflow_run.html_url }}
+        run: |
+          set -euo pipefail
+          [ -n "${NOTIFICATION_URL}" ] || { echo "::error::Missing failure notification URL"; exit 1; }
+          repo_slug="${REPOSITORY//\//-}"
+          thread_key="ci-${repo_slug}-${RUN_ID}-${RUN_ATTEMPT}"
+          payload="$(jq -n --arg repository "${REPOSITORY}" --arg workflow "${WORKFLOW_NAME}" --arg run_url "${RUN_URL}" '{text: ("Scheduled integration checks failed\n\nRepository: " + $repository + "\nWorkflow: " + $workflow + "\nRun: " + $run_url)}')"
+          curl --fail-with-body --silent --show-error --retry 3 --retry-connrefused --retry-delay 2 --retry-max-time 90 --connect-timeout 10 --max-time 30 -X POST "${NOTIFICATION_URL}&threadKey=${thread_key}&messageReplyOption=REPLY_MESSAGE_FALLBACK_TO_NEW_THREAD" -H 'Content-Type: application/json' --data "${payload}"
+
+      - name: Send signed failure event
+        if: always()
+        env:
+          RECEIVER_URL: ${{ secrets.SCHEDULED_FAILURE_RECEIVER_URL }}
+          SIGNING_SECRET: ${{ secrets.SCHEDULED_FAILURE_SIGNING_SECRET }}
+          FAILURE_ENVIRONMENT: ${{ secrets.SCHEDULED_FAILURE_ENVIRONMENT }}
+          REPOSITORY: ${{ github.repository }}
+          WORKFLOW_NAME: ${{ github.event.workflow_run.name }}
+          RUN_ID: ${{ github.event.workflow_run.id }}
+          RUN_ATTEMPT: ${{ github.event.workflow_run.run_attempt }}
+          RUN_URL: ${{ github.event.workflow_run.html_url }}
+          HEAD_SHA: ${{ github.event.workflow_run.head_sha }}
+        run: |
+          set -euo pipefail
+          [ -n "${RECEIVER_URL}" ] || { echo "::error::Missing failure receiver URL"; exit 1; }
+          [ -n "${SIGNING_SECRET}" ] || { echo "::error::Missing failure signing secret"; exit 1; }
+          [ -n "${FAILURE_ENVIRONMENT}" ] || { echo "::error::Missing failure environment"; exit 1; }
+          echo "::add-mask::${SIGNING_SECRET}"
+          repo_slug="${REPOSITORY//\//-}"
+          thread_key="ci-${repo_slug}-${RUN_ID}-${RUN_ATTEMPT}"
+          payload="$(jq -c -n --arg event_type "scheduled_ci_failure" --arg source "${REPOSITORY}" --arg repository "${REPOSITORY}" --arg workflow "${WORKFLOW_NAME}" --arg source_job "${WORKFLOW_NAME}" --arg environment "${FAILURE_ENVIRONMENT}" --argjson run_id "${RUN_ID}" --argjson run_attempt "${RUN_ATTEMPT}" --arg run_url "${RUN_URL}" --arg head_sha "${HEAD_SHA}" --arg chat_thread_key "${thread_key}" '{$event_type, $source, $repository, $workflow, $source_job, $environment, $run_id, $run_attempt, $run_url, $head_sha, $chat_thread_key}')"
+          signature="$(printf '%s' "${payload}" | openssl dgst -sha256 -hmac "${SIGNING_SECRET}" -binary | xxd -p -c 256)"
+          request_id="ci:${REPOSITORY}:${RUN_ID}:${RUN_ATTEMPT}:${FAILURE_ENVIRONMENT}"
+          curl --fail-with-body --silent --show-error --retry 3 --retry-connrefused --retry-delay 2 --retry-max-time 90 --connect-timeout 10 --max-time 30 -X POST "${RECEIVER_URL}" -H 'Content-Type: application/json' -H 'X-GitHub-Event: workflow_run' -H "X-Hub-Signature-256: sha256=${signature}" -H "X-Inkbox-Request-Id: ${request_id}" --data-binary "${payload}"
diff --git a/pyproject.toml b/pyproject.toml
index 00e0f70..a34ae1b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "codex-plugin"
-version = "0.2.10"
+version = "0.2.11"
 description = "Inkbox bridge for Codex — talk to your coding agent over email, SMS, iMessage, and voice"
 requires-python = ">=3.11"
 dependencies = [
diff --git a/tests/test_scheduled_failure_reporting.py b/tests/test_scheduled_failure_reporting.py
new file mode 100644
index 0000000..bfca6f1
--- /dev/null
+++ b/tests/test_scheduled_failure_reporting.py
@@ -0,0 +1,25 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def test_scheduled_failures_use_one_verified_reporting_path():
+    canary = (ROOT / ".github/workflows/canary.yml").read_text()
+    stack = (ROOT / ".github/workflows/live-stack.yml").read_text()
+    report = (ROOT / ".github/workflows/scheduled-failure-report.yml").read_text()
+
+    assert "workflow_call:" in canary
+    assert "schedule:" not in canary
+    assert "notify:" not in canary
+    assert "schedule:" in stack
+    assert "uses: ./.github/workflows/canary.yml" in stack
+    assert "workflow_run:" not in stack
+    assert "notify:" not in stack
+    assert 'workflows: ["Full stack e2e"]' in report
+    assert "github.event.workflow_run.event == 'schedule'" in report
+    assert "failure" in report and "timed_out" in report and "startup_failure" in report
+    assert "if: always()" in report
+    assert "actions: read" in report
+    assert "X-Hub-Signature-256" in report
+    assert "chat_thread_key" in report