feat(workflows): add sandboxed OriginWeave browser evidence

.github/workflows/originweave-mv3-evidence.yml

@@ -0,0 +1,89 @@
+name: Reusable OriginWeave sandboxed MV3 evidence
+
+on:
+  workflow_call:
+
+permissions:
+  contents: read
+
+jobs:
+  chrome-for-testing:
+    name: Pinned Chrome for Testing MV3 fixture
+    runs-on: ubuntu-24.04
+    timeout-minutes: 20
+    steps:
+      - name: Harden runner and block undeclared egress
+        uses: step-security/harden-runner@bf7454d06d71f1098171f2acdf0cd4708d7b5920 # v2.20.0
+        with:
+          egress-policy: block
+          disable-telemetry: true
+          allowed-endpoints: >-
+            api.github.com:443
+            github.com:443
+            codeload.github.com:443
+            objects.githubusercontent.com:443
+            release-assets.githubusercontent.com:443
+            storage.googleapis.com:443
+            *.actions.githubusercontent.com:443
+            *.blob.core.windows.net:443
+            results-receiver.actions.githubusercontent.com:443
+
+      - name: Verify OriginWeave caller
+        shell: bash
+        run: test "$GITHUB_REPOSITORY" = "ContextualWisdomLab/OriginWeave"
+
+      - name: Checkout exact caller revision
+        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          persist-credentials: false
+
+      - name: Download and verify exact Chrome for Testing pair
+        shell: bash
+        env:
+          CHROME_VERSION: "150.0.7871.129"
+        run: |
+          set -euo pipefail
+          base="https://storage.googleapis.com/chrome-for-testing-public/${CHROME_VERSION}/linux64"
+          curl --fail --location --proto '=https' --tlsv1.2 --retry 3 \
+            --output chrome-linux64.zip "${base}/chrome-linux64.zip"
+          curl --fail --location --proto '=https' --tlsv1.2 --retry 3 \
+            --output chromedriver-linux64.zip "${base}/chromedriver-linux64.zip"
+          printf '%s  %s\n' \
+            '3c8aa248aab79834862fcdc7593181b82b9079feb4a192d9ca1855c576e50060' \
+            'chrome-linux64.zip' \
+            'eb71d98fc5415d03f02949cad0bf7b2eba02715ade6fbeedefcb4d783f7695f3' \
+            'chromedriver-linux64.zip' \
+            > mv3-download-sha256.txt
+          sha256sum --check mv3-download-sha256.txt
+          mkdir -p .mv3-browser
+          unzip -q chrome-linux64.zip -d .mv3-browser
+          unzip -q chromedriver-linux64.zip -d .mv3-browser
+          chmod 0755 \
+            .mv3-browser/chrome-linux64/chrome \
+            .mv3-browser/chromedriver-linux64/chromedriver
+          sudo chown root:root .mv3-browser/chrome-linux64/chrome_sandbox
+          sudo chmod 4755 .mv3-browser/chrome-linux64/chrome_sandbox
+
+      - name: Execute OriginWeave browser evidence
+        shell: bash
+        env:
+          CHROME_BIN: ${{ github.workspace }}/.mv3-browser/chrome-linux64/chrome
+          CHROMEDRIVER_BIN: ${{ github.workspace }}/.mv3-browser/chromedriver-linux64/chromedriver
+          CHROME_DEVEL_SANDBOX: ${{ github.workspace }}/.mv3-browser/chrome-linux64/chrome_sandbox
+        run: |
+          set -euo pipefail
+          "$CHROME_BIN" --version
+          "$CHROMEDRIVER_BIN" --version
+          python3 scripts/ci/run_mv3_compatibility.py | tee mv3-compatibility.json
+
+      - name: Upload bounded compatibility evidence
+        if: always()
+        uses: actions/upload-artifact@ea165f8d65b6e75b540449e92b4886f43607fa02 # v4.6.2
+        with:
+          name: mv3-compatibility-${{ github.event.pull_request.head.sha || github.sha }}
+          path: |
+            mv3-download-sha256.txt
+            mv3-compatibility.json
+          if-no-files-found: warn
+          retention-days: 7

CHANGELOG.md

@@ -15,6 +15,10 @@
 - Raised `hourly-review-repair.yml`'s discovery ceiling from 50 to 200 while rotating deterministic 50-PR deep-inspection windows by hourly run number. The scheduler hydrates only the selected window and stops immediately after its single dispatch, preserving access to newer PRs without quadrupling expensive review/check/comment work. See `docs/doctoring/hourly-review-repair-single-file-consolidation.md`'s 2026-09-03 follow-up.
 
 ## [Unreleased]
+- Add a reusable, read-only OriginWeave MV3 evidence workflow that verifies the
+  exact Chrome/ChromeDriver archives, configures Chromium's sandbox helper,
+  executes the product-owned runner at the caller head, and retains bounded
+  evidence without accepting secrets or caller-authored shell input.
 - Include merge-scheduler entrypoint, core, and regression-test changes in
   the existing runtime-quality workflow's trigger and suite selector. Scheduler
   workflow edits retain queue checks and also select the full review-repair

docs/doctoring/originweave-mv3-evidence.md

@@ -0,0 +1,25 @@
+# OriginWeave sandboxed browser evidence
+
+The reusable `originweave-mv3-evidence.yml` workflow owns the trusted runner,
+Chrome for Testing supply-chain, sandbox-helper, and artifact mechanics for
+OriginWeave's real-browser evidence. Product fixtures and interpretation remain
+in OriginWeave; the central workflow executes its checked-out
+`scripts/ci/run_mv3_compatibility.py` entry point at the exact caller revision.
+
+The workflow accepts only the OriginWeave repository, grants read-only contents
+permission, downloads Chrome and ChromeDriver 150.0.7871.129 over declared
+egress, verifies both archives against SHA-256 values recovered from successful
+OriginWeave run 33866932365, and configures the archive's root-owned mode-4755
+`chrome_sandbox` through `CHROME_DEVEL_SANDBOX`. It receives no secrets and
+does not contain product browser policy.
+
+An OriginWeave caller must pin this workflow file to the reviewed protected-main
+commit that introduces it. A branch or tag reference is not accepted evidence.
+Changing the browser build, checksums, sandbox mechanism, permissions, egress,
+or artifact contract requires a new central review and fresh consumer execution.
+
+This owner workflow does not itself prove an OriginWeave feature. Acceptance
+still requires an exact-head consumer run whose product-owned runner emits all
+required trials and surfaces successfully. Runner unavailability, archive
+verification failure, browser-session startup failure, product-contract
+failure, and cancellation remain distinct from a successful run.

tests/test_originweave_mv3_workflow_contract.py

@@ -0,0 +1,27 @@
+"""Contract for the centrally owned OriginWeave browser-evidence workflow."""
+
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+WORKFLOW = ROOT / ".github" / "workflows" / "originweave-mv3-evidence.yml"
+
+
+def test_originweave_mv3_workflow_is_pinned_sandboxed_and_least_privilege() -> None:
+    """The owner workflow must verify artifacts and preserve Chromium sandboxing."""
+
+    workflow = WORKFLOW.read_text(encoding="utf-8")
+    assert "workflow_call:" in workflow
+    assert "permissions:\n  contents: read" in workflow
+    assert "ContextualWisdomLab/OriginWeave" in workflow
+    assert "150.0.7871.129" in workflow
+    assert "3c8aa248aab79834862fcdc7593181b82b9079feb4a192d9ca1855c576e50060" in workflow
+    assert "eb71d98fc5415d03f02949cad0bf7b2eba02715ade6fbeedefcb4d783f7695f3" in workflow
+    assert "sha256sum --check" in workflow
+    assert "sudo chown root:root" in workflow
+    assert "sudo chmod 4755" in workflow
+    assert "CHROME_DEVEL_SANDBOX" in workflow
+    assert "--no-sandbox" not in workflow
+    assert "scripts/ci/run_mv3_compatibility.py" in workflow
+    assert "secrets:" not in workflow
+    assert "persist-credentials: false" in workflow