diff --git a/.github/workflows/actions.lock b/.github/workflows/actions.lock
index 04da3687..2466b667 100644
--- a/.github/workflows/actions.lock
+++ b/.github/workflows/actions.lock
@@ -304,6 +304,11 @@ dependencies:
         commit: 'sha1-2155aa26a21758f2ba119f61bc7e0e1981c106fb'
         owner_id: 6759885
         repo_id: 1275650185
+    'hyperpolymath/smtp-notify-action@v0.2.0':
+        ref: 'v0.2.0'
+        commit: 'sha1-ede1191ef6ff3ac02c4f4d9efdf837ee517e11d7'
+        owner_id: 6759885
+        repo_id: 1352485172
     'ruby/setup-ruby@v1.321.0':
         ref: 'v1.321.0'
         commit: 'sha1-95ef2b042f9d7a56d8268cba8559e2842e2ad01b'
diff --git a/.github/workflows/dependabot-automerge.yml b/.github/workflows/dependabot-automerge.yml
index 4742b314..86842d10 100644
--- a/.github/workflows/dependabot-automerge.yml
+++ b/.github/workflows/dependabot-automerge.yml
@@ -54,7 +54,7 @@ concurrency:
 jobs:
   automerge:
     # Only run for PRs actually authored by Dependabot.
-    if: github.actor == 'dependabot[bot]' && github.event.pull_request.user.login == 'dependabot[bot]'
+    if: github.actor_id == '49699333' && github.event.pull_request.user.login == 'dependabot[bot]'
     runs-on: ubuntu-latest
     timeout-minutes: 30
     permissions:
diff --git a/lib/rules/research_extensions.ex b/lib/rules/research_extensions.ex
index 8e3ef65b..2eac987a 100644
--- a/lib/rules/research_extensions.ex
+++ b/lib/rules/research_extensions.ex
@@ -158,9 +158,12 @@ defmodule Hypatia.Rules.ResearchExtensions do
   # ─── RE001: Harden-Runner absent on secrets-touching workflow ─────────
 
   @doc """
-  RE001: Workflow references `${{ secrets.* }}` but does not install
-  `step-security/harden-runner`. Provenance: StepSecurity Harden-Runner
-  deployment guide.
+  RE001: Reports each locally executed workflow job that references
+  `${{ secrets.* }}` without installing `step-security/harden-runner`
+  in that job. Fully commented lines and reusable-only jobs are ignored.
+
+  Each warning points to the first active secret reference in the affected
+  job. Provenance: StepSecurity Harden-Runner deployment guide.
 
   Severity: `:warn`. Action: `:report`.
   """
@@ -171,37 +174,94 @@ defmodule Hypatia.Rules.ResearchExtensions do
       content = File.read!(path)
       rel = Path.relative_to(path, repo_path)
 
-      touches_secrets? = Regex.match?(~r/\$\{\{\s*secrets\.[A-Za-z_][A-Za-z0-9_]*/, content)
+      # Comments are not runner configuration. Preserve physical line numbers
+      # so existing findings are not reported against a newly added line-1 header.
+      active_lines =
+        content
+        |> String.split("\n")
+        |> Enum.with_index(1)
+        |> Enum.reject(fn {line, _} -> String.starts_with?(String.trim_leading(line), "#") end)
 
-      installs_harden? = Regex.match?(~r/uses:\s*step-security\/harden-runner/, content)
+      active_lines
+      |> workflow_job_lines()
+      |> Enum.flat_map(fn job_lines ->
+        active_content = Enum.map_join(job_lines, "\n", &elem(&1, 0))
 
-      if touches_secrets? and not installs_harden? do
-        [
-          %{
-            rule: "RE001",
-            file: rel,
-            severity: :warn,
-            reason:
-              "workflow #{rel} references `secrets.*` but does not install " <>
-                "`step-security/harden-runner` — no outbound-egress telemetry",
-            action: :report,
-            detail: %{
-              fix:
-                "Add as the first step of each job:\n" <>
-                  "  - uses: step-security/harden-runner@<SHA>\n" <>
-                  "    with:\n" <>
-                  "      egress-policy: block\n" <>
-                  "      allowed-endpoints: >\n" <>
-                  "        github.com:443"
+        secret_line =
+          Enum.find(job_lines, fn {line, _} ->
+            Regex.match?(~r/\$\{\{\s*secrets\.[A-Za-z_][A-Za-z0-9_]*/, line)
+          end)
+
+        # Reusable jobs delegate their runtime to the source workflow. A sibling's
+        # runner or hardener cannot establish this job's execution policy.
+        local_runner? = Regex.match?(~r/^\s+runs-on:/m, active_content)
+
+        installs_harden? =
+          Regex.match?(~r/^\s+(?:-\s+)?uses:\s*step-security\/harden-runner@/m, active_content)
+
+        if not is_nil(secret_line) and local_runner? and not installs_harden? do
+          {_source, line} = secret_line
+
+          [
+            %{
+              rule: "RE001",
+              file: rel,
+              severity: :warn,
+              line: line,
+              reason:
+                "job in #{rel} references `secrets.*` but does not install " <>
+                  "`step-security/harden-runner` — review outbound-egress monitoring",
+              action: :report,
+              detail: %{
+                fix:
+                  "Add harden-runner as the first step of this job, with egress-policy: block " <>
+                    "and an allowlist derived from the job's actual required endpoints."
+              }
             }
-          }
-        ]
-      else
-        []
-      end
+          ]
+        else
+          []
+        end
+      end)
     end)
   end
 
+  # Follow block-style jobs by indentation, retaining physical source lines.
+  # As with the other research rules, this is a local static text analysis.
+  defp workflow_job_lines(lines) do
+    {_in_jobs, _indent, groups} =
+      Enum.reduce(lines, {false, nil, []}, fn {line, _} = entry, {in_jobs, indent, groups} ->
+        cond do
+          Regex.match?(~r/^jobs:\s*(?:#.*)?$/, line) ->
+            {true, nil, groups}
+
+          not in_jobs ->
+            {false, indent, groups}
+
+          Regex.match?(~r/^\S/, line) ->
+            {false, nil, groups}
+
+          true ->
+            header = Regex.run(~r/^(\s+)(?:[A-Za-z0-9_-]+|"[^"]+"|'[^']+'):/, line)
+            width = if header, do: String.length(Enum.at(header, 1)), else: nil
+
+            cond do
+              width && (is_nil(indent) || width == indent) ->
+                {true, width, [[entry] | groups]}
+
+              groups != [] ->
+                [current | rest] = groups
+                {true, indent, [[entry | current] | rest]}
+
+              true ->
+                {true, indent, groups}
+            end
+        end
+      end)
+
+    groups |> Enum.reverse() |> Enum.map(&Enum.reverse/1)
+  end
+
   # ─── RE002: Harden-Runner in audit-only mode ─────────────────────────
 
   @doc """
diff --git a/test/research_extensions_test.exs b/test/research_extensions_test.exs
index 4e57e37b..bcaf94ab 100644
--- a/test/research_extensions_test.exs
+++ b/test/research_extensions_test.exs
@@ -43,6 +43,40 @@ defmodule Hypatia.Rules.ResearchExtensionsTest do
       assert length(findings) == 1
       assert hd(findings).rule == "RE001"
       assert hd(findings).severity == :warn
+      assert hd(findings).line == 7
+      File.rm_rf!(repo)
+    end
+
+    test "reusable-only callers delegate runner hardening to the workflow source" do
+      repo =
+        create_repo_with_workflow("""
+        jobs:
+          mirror:
+            uses: owner/standards/.github/workflows/mirror.yml@main
+            secrets:
+              MIRROR_KEY: ${{ secrets.MIRROR_KEY }}
+        """)
+
+      assert ResearchExtensions.re001_missing_harden_runner(repo) == []
+      File.rm_rf!(repo)
+    end
+
+    test "commented hardening does not hide a real secret reference or move its location" do
+      repo =
+        create_repo_with_workflow("""
+        # A managed header added by the action-lock tool
+        # uses: step-security/harden-runner@main
+        # Example: ${{ secrets.EXAMPLE }}
+        jobs:
+          deploy:
+            runs-on: ubuntu-latest
+            steps:
+              - run: deploy --token=${{ secrets.DEPLOY_KEY }}
+        """)
+
+      [finding] = ResearchExtensions.re001_missing_harden_runner(repo)
+      assert finding.line == 8
+      assert finding.severity == :warn
       File.rm_rf!(repo)
     end
 
@@ -63,6 +97,86 @@ defmodule Hypatia.Rules.ResearchExtensionsTest do
       File.rm_rf!(repo)
     end
 
+    test "passes when harden-runner uses values are quoted" do
+      repo =
+        create_repo_with_workflow("""
+        jobs:
+          double-quoted:
+            runs-on: ubuntu-latest
+            steps:
+              - uses: "step-security/harden-runner@main"
+              - run: deploy --token=${{ secrets.DOUBLE_QUOTED_KEY }}
+          single-quoted:
+            runs-on: ubuntu-latest
+            steps:
+              - uses: 'step-security/harden-runner@main'
+              - run: deploy --token=${{ secrets.SINGLE_QUOTED_KEY }}
+        """)
+
+      assert ResearchExtensions.re001_missing_harden_runner(repo) == []
+      File.rm_rf!(repo)
+    end
+
+    test "does not treat nested multiline values as runner configuration or hardening" do
+      repo =
+        create_repo_with_workflow("""
+        jobs:
+          nested-values:
+            env:
+              WORKFLOW_EXAMPLE: |
+                runs-on: ubuntu-latest
+                - uses: step-security/harden-runner@main
+            steps:
+              - run: deploy --token=${{ secrets.NESTED_ONLY }}
+          exposed:
+            runs-on: ubuntu-latest
+            steps:
+              - run: |
+                  runs-on: ubuntu-latest
+                  - uses: step-security/harden-runner@main
+                  deploy --token=${{ secrets.EXPOSED }}
+        """)
+
+      [finding] = ResearchExtensions.re001_missing_harden_runner(repo)
+      assert finding.line == 15
+      File.rm_rf!(repo)
+    end
+
+    test "mixed reusable and local jobs do not share runner or hardening state" do
+      repo =
+        create_repo_with_workflow("""
+        jobs:
+          shared:
+            uses: owner/standards/.github/workflows/mirror.yml@main
+            secrets:
+              MIRROR_KEY: ${{ secrets.MIRROR_KEY }}
+          local:
+            runs-on: ubuntu-latest
+            steps:
+              - run: echo no credentials
+        """)
+
+      assert ResearchExtensions.re001_missing_harden_runner(repo) == []
+
+      File.write!(Path.join([repo, ".github/workflows", "test.yml"]), """
+      jobs:
+        hardened:
+          runs-on: ubuntu-latest
+          steps:
+            - uses: step-security/harden-runner@main
+            - run: deploy --token=${{ secrets.ONE }}
+        exposed:
+          runs-on: ubuntu-latest
+          steps:
+            - run: deploy --token=${{ secrets.TWO }}
+      """)
+
+      [finding] = ResearchExtensions.re001_missing_harden_runner(repo)
+      assert finding.line == 10
+      assert finding.severity == :warn
+      File.rm_rf!(repo)
+    end
+
     test "passes when no secrets are referenced" do
       repo =
         create_repo_with_workflow("""
diff --git a/test/research_extensions_wiring_test.exs b/test/research_extensions_wiring_test.exs
index 288399b2..b232befd 100644
--- a/test/research_extensions_wiring_test.exs
+++ b/test/research_extensions_wiring_test.exs
@@ -25,7 +25,7 @@ defmodule Hypatia.Rules.ResearchExtensionsWiringTest do
 
   @tmp_dir System.tmp_dir!()
 
-  # Trips RE001 (touches `secrets.*` with no harden-runner; :warn, no line)
+  # Trips RE001 (touches `secrets.*` with no harden-runner; :warn, source line)
   # and RE004 (`docker://` pinned by tag; :warn, line nested under :detail).
   @tripwire """
   name: Deploy
@@ -81,6 +81,28 @@ defmodule Hypatia.Rules.ResearchExtensionsWiringTest do
   end
 
   describe ":line carry-through" do
+    test "RE001 points to the secret reference through CLI and SARIF" do
+      repo = tripwire_repo()
+
+      finding =
+        Enum.find(CLI.collect_findings(repo, [:research_extensions]), &(&1.type == "RE001"))
+
+      assert finding.line == 8
+      sarif = SARIF.from_findings([finding], repo)
+
+      assert get_in(sarif, [
+               "runs",
+               Access.at(0),
+               "results",
+               Access.at(0),
+               "locations",
+               Access.at(0),
+               "physicalLocation",
+               "region",
+               "startLine"
+             ]) == 8
+    end
+
     test "RE004's line, nested under :detail, survives normalization" do
       f = re004(tripwire_repo())
 
@@ -121,7 +143,15 @@ defmodule Hypatia.Rules.ResearchExtensionsWiringTest do
         ExUnit.CaptureIO.capture_io(:stderr, fn ->
           output =
             ExUnit.CaptureIO.capture_io(fn ->
-              CLI.main(["scan", repo, "--rules", "research_extensions", "--format", "github", "--exit-zero"])
+              CLI.main([
+                "scan",
+                repo,
+                "--rules",
+                "research_extensions",
+                "--format",
+                "github",
+                "--exit-zero"
+              ])
             end)
 
           assert output =~ "::warning"