diff --git a/scripts/fleet_monitor.sh b/scripts/fleet_monitor.sh
index 0b1f35886..1b3666e79 100755
--- a/scripts/fleet_monitor.sh
+++ b/scripts/fleet_monitor.sh
@@ -723,7 +723,9 @@ fi
 # Produces fleet_stub_drift.json — the DRIFTED enrolled repos across every
 # processed stub, each row tagged with its `stub`/`stub_file` so the workflow's
 # "Track stub drift" step can group/route per stub kind. HAS_STUB_DRIFT wakes
-# dev-lead. A combined empty array is emitted when no stub drifted.
+# dev-lead. A combined empty array is emitted when no stub drifted. Role rows
+# classified from a legacy per-role file (repo has no agent-ingress.yml) are left
+# out by stub_drift_alert_json and appear only in the report, marked legacy (#2289).
 # ---------------------------------------------------------------------------
 STUB_DRIFT_JSON="fleet_stub_drift.json"
 if [ ${#stub_drift_files[@]} -gt 0 ]; then
diff --git a/scripts/fleet_stub_drift.sh b/scripts/fleet_stub_drift.sh
index 1ae964d25..29ff67cbe 100755
--- a/scripts/fleet_stub_drift.sh
+++ b/scripts/fleet_stub_drift.sh
@@ -14,8 +14,10 @@
 # GitHub's contents API returns in `.sha` (git blob object IDs), so equal SHAs
 # mean byte-identical files. Network fetching lives in fleet_monitor.sh.
 #
-# Drift TSV format (4 fields, tab-separated):
-#   1:repo  2:status  3:repo_sha  4:canonical_sha
+# Drift TSV format (4 fields, tab-separated, plus an optional 5th):
+#   1:repo  2:status  3:repo_sha  4:canonical_sha  [5:source]
+# source is `legacy` on a collapsed-role row classified from the legacy per-role
+# file because the repo has no agent-ingress.yml (#2289); absent otherwise.
 # status ∈ { ALIGNED, DRIFTED, MISSING }
 #   ALIGNED — stub present and byte-identical to the canonical template
 #   DRIFTED — stub present but its blob SHA differs (the alertable set)
@@ -151,19 +153,21 @@ classify_role_drift() {
 # through the identical report/alert path as whole-file (#822/#886) rows. The
 # emitted repo_sha/canonical_sha are the pair the classification was actually made
 # on: the block SHAs when an agent-ingress.yml is present, else the legacy
-# whole-file SHAs — so the rendered table stays meaningful either way.
+# whole-file SHAs — so the rendered table stays meaningful either way. A
+# legacy-fallback row carries a 5th field `legacy` (#2289): it is not
+# agent-ingress.yml drift, so stub_drift_alert_json keeps it out of the alert /
+# remediation set while generate_stub_drift_report still lists it.
 stub_drift_row_role() {
   local repo="${1:-}" ingress_present="${2:-}" canon_block="${3:-}"
   local ingress_block="${4:-}" legacy_canon="${5:-}" legacy_repo="${6:-}"
-  local status repo_sha canonical
+  local status
   status="$(classify_role_drift "$ingress_present" "$canon_block" \
     "$ingress_block" "$legacy_canon" "$legacy_repo")"
   if [ "$ingress_present" = "yes" ]; then
-    repo_sha="$ingress_block"; canonical="$canon_block"
+    printf '%s\t%s\t%s\t%s\n' "$repo" "$status" "$ingress_block" "$canon_block"
   else
-    repo_sha="$legacy_repo"; canonical="$legacy_canon"
+    printf '%s\t%s\t%s\t%s\tlegacy\n' "$repo" "$status" "$legacy_repo" "$legacy_canon"
   fi
-  printf '%s\t%s\t%s\t%s\n' "$repo" "$status" "$repo_sha" "$canonical"
 }
 
 # count_stub_drift <tsv_file> <status>
@@ -182,6 +186,11 @@ count_stub_drift() {
 # <role> is given (a collapsed agent-ingress.yml job, #1726), each row is also
 # tagged with `role` so remediation patches the RIGHT job block — the stub_file
 # alone is ambiguous once several roles share one agent-ingress.yml.
+# Rows tagged `legacy` (classified from a legacy per-role file because the repo
+# has no agent-ingress.yml, #2289) are EXCLUDED: stamping them with the
+# agent-ingress.yml stub_file would tell dev-lead / remediation to write an
+# ingress into a repo that has none — the ADR-0007 double-dispatch trap. The
+# compliance audit's stub-surface checks govern legacy per-role stubs.
 stub_drift_alert_json() {
   local f="${1:-}" stub_label="${2:-}" stub_file="${3:-}" role="${4:-}"
   if [ -z "$f" ] || [ ! -s "$f" ]; then
@@ -192,7 +201,7 @@ stub_drift_alert_json() {
     [ inputs
       | select(length > 0)
       | split("\t")
-      | select(length >= 4 and .[1] == "DRIFTED")
+      | select(length >= 4 and .[1] == "DRIFTED" and .[4] != "legacy")
       | { repo: .[0], status: .[1], repo_sha: .[2], canonical_sha: .[3] }
       | if $stub != "" then . + { stub: $stub } else . end
       | if $stub_file != "" then . + { stub_file: $stub_file } else . end
@@ -224,10 +233,22 @@ generate_stub_drift_report() {
     return 0
   fi
 
-  printf 'These enrolled repos have drifted from the canonical stub — re-sync them:\n\n'
-  printf '| Repo | Status | Stub SHA | Canonical SHA |\n'
-  printf '|---|---|---|---|\n'
-  awk -F'\t' '$2 == "DRIFTED" {
-    printf "| `%s` | 🔴 %s | `%s` | `%s` |\n", $1, $2, substr($3,1,7), substr($4,1,7)
-  }' "$f"
+  if awk -F'\t' '$2 == "DRIFTED" && $5 != "legacy" { found = 1; exit } END { exit !found }' "$f"; then
+    printf 'These enrolled repos have drifted from the canonical stub — re-sync them:\n\n'
+    printf '| Repo | Status | Stub SHA | Canonical SHA |\n'
+    printf '|---|---|---|---|\n'
+    awk -F'\t' '$2 == "DRIFTED" && $5 != "legacy" {
+      printf "| `%s` | 🔴 %s | `%s` | `%s` |\n", $1, $2, substr($3,1,7), substr($4,1,7)
+    }' "$f"
+  fi
+
+  if awk -F'\t' '$2 == "DRIFTED" && $5 == "legacy" { found = 1; exit } END { exit !found }' "$f"; then
+    printf '\n### Legacy per-role stubs (repos without agent-ingress.yml)\n\n'
+    printf 'These repos use per-role stubs and are not enrolled in agent-ingress.yml. They are not alerted or remediated in the above; the compliance audit stub-surface checks cover them.\n\n'
+    printf '| Repo | Status | Stub SHA | Canonical SHA |\n'
+    printf '|---|---|---|---|\n'
+    awk -F'\t' '$2 == "DRIFTED" && $5 == "legacy" {
+      printf "| `%s` | 🔴 %s | `%s` | `%s` |\n", $1, $2, substr($3,1,7), substr($4,1,7)
+    }' "$f"
+  fi
 }
diff --git a/tests/fleet_stub_drift.bats b/tests/fleet_stub_drift.bats
index a605c2fab..1d7a0e428 100644
--- a/tests/fleet_stub_drift.bats
+++ b/tests/fleet_stub_drift.bats
@@ -289,9 +289,54 @@ INGRESS_NO_DEVLEAD="${BATS_TEST_DIRNAME}/fixtures/agent-ingress/collapsed-no-dev
   [ "$output" = "$(printf 'petry-projects/charlie\tMISSING\t\t%s' "$canon_dl")" ]
 }
 
-@test "stub_drift_row_role: no ingress (legacy repo) emits the legacy whole-file SHAs (AC #4)" {
+@test "stub_drift_row_role: no ingress (legacy repo) emits the legacy whole-file SHAs, tagged legacy (AC #4, #2289)" {
   local canon="cafecafecafecafecafecafecafecafecafecafe"
   run stub_drift_row_role "petry-projects/delta" "no" "block-sha-ignored" "" "$canon" "$canon"
   [ "$status" -eq 0 ]
-  [ "$output" = "$(printf 'petry-projects/delta\tALIGNED\t%s\t%s' "$canon" "$canon")" ]
+  [ "$output" = "$(printf 'petry-projects/delta\tALIGNED\t%s\t%s\tlegacy' "$canon" "$canon")" ]
+}
+
+# ---------------------------------------------------------------------------
+# Legacy-fallback rows (#2289): a role row classified from the legacy per-role
+# file (no agent-ingress.yml) is reported but never alerted or remediated as
+# agent-ingress.yml drift.
+# ---------------------------------------------------------------------------
+
+@test "stub_drift_alert_json: a legacy-tagged DRIFTED row is excluded; an ingress row is kept (#2289)" {
+  tsv="$(mktemp)"
+  stub_drift_row_role "petry-projects/legacy" "no" "" "" "$CANON" "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee" > "$tsv"
+  stub_drift_row_role "petry-projects/markets" "yes" "$CANON" "ffffffffffffffffffffffffffffffffffffffff" "" "" >> "$tsv"
+  run stub_drift_alert_json "$tsv" "Dev-lead" ".github/workflows/agent-ingress.yml" "dev-lead"
+  rm -f "$tsv"
+  [ "$status" -eq 0 ]
+  [ "$(printf '%s' "$output" | jq -c '[.[] | {repo, stub_file, role}]')" = \
+    '[{"repo":"petry-projects/markets","stub_file":".github/workflows/agent-ingress.yml","role":"dev-lead"}]' ]
+}
+
+@test "generate_stub_drift_report: a legacy DRIFTED row stays in the table, marked legacy and not alerted (#2289)" {
+  tsv="$(mktemp)"
+  stub_drift_row_role "petry-projects/legacy" "no" "" "" "$CANON" "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee" > "$tsv"
+  stub_drift_row_role "petry-projects/markets" "yes" "$CANON" "ffffffffffffffffffffffffffffffffffffffff" "" "" >> "$tsv"
+  run generate_stub_drift_report "$tsv" "$CANON" "Dev-lead"
+  rm -f "$tsv"
+  [ "$status" -eq 0 ]
+  [[ "$output" == *"🔴 DRIFTED: 2"* ]]
+  local legacy_section before_legacy
+  legacy_section="$(printf '%s\n' "$output" | sed -n '/^### Legacy per-role stubs/,$p')"
+  before_legacy="$(printf '%s\n' "$output" | sed '/^### Legacy per-role stubs/,$d')"
+  [[ "$legacy_section" == *'`petry-projects/legacy`'* ]]
+  [[ "$legacy_section" != *'`petry-projects/markets`'* ]]
+  [[ "$before_legacy" == *'`petry-projects/markets`'* ]]
+  [[ "$before_legacy" != *'`petry-projects/legacy`'* ]]
+  [[ "$output" == *"not alerted"* ]]
+}
+
+@test "generate_stub_drift_report: legacy-only drift omits the re-sync remediation table (#2289)" {
+  tsv="$(mktemp)"
+  stub_drift_row_role "petry-projects/legacy" "no" "" "" "$CANON" "eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee" > "$tsv"
+  run generate_stub_drift_report "$tsv" "$CANON" "Dev-lead"
+  rm -f "$tsv"
+  [ "$status" -eq 0 ]
+  [[ "$output" != *"re-sync them"* ]]
+  [[ "$output" == *"### Legacy per-role stubs"* ]]
 }
diff --git a/tests/fleet_stub_registry.bats b/tests/fleet_stub_registry.bats
index eee405ba0..9216e386e 100644
--- a/tests/fleet_stub_registry.bats
+++ b/tests/fleet_stub_registry.bats
@@ -286,3 +286,68 @@ registry_rows() {
   [ "$(role_counts Ci-failure-analyst)" = "$(counts_line 0 0 1)" ]
   grep -qF "repos/petry-projects/legacy/contents/.github/workflows/dev-lead.yml" "$CALLS"
 }
+
+# ---------------------------------------------------------------------------
+# #2289 — a legacy repo (no agent-ingress.yml) is classified from its per-role
+# file, but its drift is NOT agent-ingress.yml drift: it is reported (marked
+# legacy) and kept out of fleet_stub_drift.json, the alert + remediation input.
+# ---------------------------------------------------------------------------
+
+# drift_dev_lead_block — print the markets ingress with ONLY the dev-lead job
+# block changed (one line inside it), so its block SHA differs from canon.
+drift_dev_lead_block() {
+  awk '
+    $0 ~ /^  dev-lead:/ { injob = 1 }
+    injob && /^    uses:/ && !done { sub(/@dev-lead\/v139-stable/, "@dev-lead/v1-stable"); done = 1 }
+    { print }
+  ' "$MARKETS_INGRESS"
+}
+
+@test "#2289(a): a legacy repo whose per-role file drifts is reported, marked legacy, but not in fleet_stub_drift.json" {
+  publish_canonicals
+  printf 'name: drifted\n' | put_file "petry-projects/legacy" ".github/workflows/dev-lead.yml"
+
+  run_monitor petry-projects/legacy
+  [ "$status" -eq 0 ]
+  [ "$(role_counts Dev-lead)" = "$(counts_line 0 1 0)" ]
+  sed -n '/^### Legacy per-role stubs/,$p' "${WORK}/fleet_monitor_report.md" | grep -qF '`petry-projects/legacy`'
+  [ "$(jq -c . "${WORK}/fleet_stub_drift.json")" = "[]" ]
+}
+
+@test "#2289(b): a collapsed repo whose block drifts is in fleet_stub_drift.json against agent-ingress.yml" {
+  publish_canonicals
+  drift_dev_lead_block | put_file "petry-projects/markets" "$INGRESS_STUB"
+  # Sanity: only the dev-lead block differs from canon.
+  [ "$(job_block_sha dev-lead < "${FAKE_ROOT}/petry-projects/markets/${INGRESS_STUB}")" != \
+    "$(job_block_sha dev-lead < "$MARKETS_INGRESS")" ]
+
+  run_monitor petry-projects/markets
+  [ "$status" -eq 0 ]
+  [ "$(role_counts Dev-lead)" = "$(counts_line 0 1 0)" ]
+  [ "$(jq -c '[.[] | {repo, stub_file, role}]' "${WORK}/fleet_stub_drift.json")" = \
+    "$(jq -nc --arg sf "$INGRESS_STUB" '[{repo: "petry-projects/markets", stub_file: $sf, role: "dev-lead"}]')" ]
+}
+
+@test "#2289(c): the remediation input never lists agent-ingress.yml for a repo that has no ingress" {
+  publish_canonicals
+  drift_dev_lead_block | put_file "petry-projects/markets" "$INGRESS_STUB"
+  # The legacy repo drifts on every role that has a per-role file.
+  local role
+  for role in "${ROLES[@]}"; do
+    printf 'name: drifted %s\n' "$role" | put_file "petry-projects/legacy" ".github/workflows/${role}.yml"
+  done
+
+  run_monitor petry-projects/legacy petry-projects/markets
+  [ "$status" -eq 0 ]
+  # The legacy repo is reported DRIFTED (dev-lead row) yet absent from the JSON.
+  [ "$(role_counts Dev-lead)" = "$(counts_line 0 2 0)" ]
+  [ "$(jq '[.[] | select(.repo == "petry-projects/legacy")] | length' "${WORK}/fleet_stub_drift.json")" -eq 0 ]
+
+  # The remediation plan built from that JSON targets only markets' ingress.
+  source "$REMEDIATE"
+  plan="$(build_remediation_plan "${WORK}/fleet_stub_drift.json")"
+  [ "$(printf '%s' "$plan" | jq -r '[.[] | select(.stub_file == "'"$INGRESS_STUB"'") | .repo] | unique | join(",")')" = "petry-projects/markets" ]
+  run bash "$REMEDIATE" "${WORK}/fleet_stub_drift.json"
+  [ "$status" -eq 0 ]
+  [[ "$output" != *"petry-projects/legacy"* ]]
+}