diff --git a/.github/workflows/pr-iphone-deploy.yml b/.github/workflows/pr-iphone-deploy.yml
index 65f4802..839a916 100644
--- a/.github/workflows/pr-iphone-deploy.yml
+++ b/.github/workflows/pr-iphone-deploy.yml
@@ -215,6 +215,15 @@ jobs:
     timeout-minutes: 120
 
     steps:
+      - name: Checkout
+        # Shallow clone — wait-approval only needs scripts/pr_lgtm_scanner.py,
+        # nothing else from the repo. Same raw-git pattern as build-deploy's
+        # Checkout step (avoids actions/checkout setup).
+        run: |
+          git clone --depth 1 -b ${{ github.head_ref }} https://x-access-token:${PR_TOKEN}@gitea.1000co.fr/${{ github.repository }}.git .
+        env:
+          PR_TOKEN: ${{ secrets.PR_API_TOKEN }}
+
       - name: Poll for LGTM
         env:
           GT_TOKEN: ${{ secrets.PR_API_TOKEN }}
@@ -233,8 +242,8 @@ jobs:
           # edits — e.g. a reviewer changing "KO" → "LGTM". Negligible cost for
           # PRs with <50 comments.
           #
-          # Parsing is done with python3 (preinstalled on the macOS runner and
-          # already used by scripts/ci-status.py) rather than grep over raw JSON:
+          # The LGTM/KO decision is computed by scripts/pr_lgtm_scanner.py
+          # (a standalone Python file) rather than grep over raw JSON:
           #   - the bot's "Ready to test" comment body literally contains the
           #     words LGTM/KO as instructions to the reviewer, so any naive
           #     body grep would self-match and auto-merge ~30s after deploy.
@@ -253,34 +262,13 @@ jobs:
             COMMENTS=$(curl -s -H "Authorization: token ${GT_TOKEN}" \
               "${API}/issues/${PR}/comments?limit=50&page=1")
 
-            DECISION=$(python3 - "$COMMENTS" <<'PY'
-import json, re, sys
-MARKER = "<!-- tabatago:ready-to-test -->"
-try:
-    comments = json.loads(sys.argv[1] or "[]")
-except Exception:
-    comments = []
-lgtm = re.compile(r"\bLGTM\b", re.IGNORECASE)
-ko    = re.compile(r"\bKO\b",   re.IGNORECASE)
-hit_lgtm = hit_ko = False
-for c in comments:
-    body = c.get("body") or ""
-    if MARKER in body:
-        # Skip the bot's own "Ready to test" comment — its body mentions
-        # LGTM/KO as instructions and would otherwise self-trigger.
-        continue
-    if ko.search(body):
-        hit_ko = True
-    if lgtm.search(body):
-        hit_lgtm = True
-if hit_ko:
-    print("KO")
-elif hit_lgtm:
-    print("LGTM")
-else:
-    print("PENDING")
-PY
-)
+            # The LGTM/KO scanner lives in scripts/pr_lgtm_scanner.py rather
+            # than inline here. Embedding multi-line Python in a YAML `run: |`
+            # block scalar is fragile — YAML dedents block-scalar content to
+            # the first line, which produced both YAML parse failures and
+            # Python IndentationErrors in earlier iterations of this workflow.
+            # A standalone script sidesteps all of that and is testable locally.
+            DECISION=$(python3 scripts/pr_lgtm_scanner.py "$COMMENTS")
 
             case "$DECISION" in
               LGTM)
diff --git a/scripts/pr_lgtm_scanner.py b/scripts/pr_lgtm_scanner.py
new file mode 100644
index 0000000..7a5d130
--- /dev/null
+++ b/scripts/pr_lgtm_scanner.py
@@ -0,0 +1,70 @@
+#!/usr/bin/env python3
+"""LGTM/KO scanner for the pr-iphone-deploy workflow's wait-approval job.
+
+Reads a Gitea PR comments JSON array (as returned by
+``/api/v1/repos/{owner}/{repo}/issues/{pr}/comments``) on argv[1] and prints
+exactly one of: ``LGTM``, ``KO``, ``PENDING``.
+
+Rules
+-----
+* The bot's own "Ready to test" comment body literally contains the words
+  ``LGTM`` and ``KO`` as instructions to the reviewer — without filtering it
+  out, the workflow would self-merge ~30s after deploy. Bot comments are
+  tagged with the sentinel ``<!-- tabatago:ready-to-test -->`` and skipped.
+* ``KO`` is checked BEFORE ``LGTM`` — a PR with both signals blocks (matches
+  the existing "KO blocks" intent).
+* Word-boundary regex (``\\bLGTM\\b`` / ``\\bKO\\b``, case-insensitive) so
+  "Tested, LGTM!" counts and "KOM" / "LGTMX" do not.
+
+This script lives in ``scripts/`` (not inline in the workflow) because
+embedding multi-line Python inside a YAML ``run: |`` block scalar is fragile:
+YAML dedents block-scalar content to the first line, which produces either a
+YAML parse failure or a Python ``IndentationError`` depending on how the
+body is indented. A standalone file sidesteps all of that.
+"""
+import json
+import re
+import sys
+
+MARKER = "<!-- tabatago:ready-to-test -->"
+LGTM_RE = re.compile(r"\bLGTM\b", re.IGNORECASE)
+KO_RE = re.compile(r"\bKO\b", re.IGNORECASE)
+
+
+def decide(comments_json: str) -> str:
+    """Return 'KO', 'LGTM', or 'PENDING' for the given comments JSON payload."""
+    try:
+        comments = json.loads(comments_json or "[]")
+    except Exception:
+        comments = []
+
+    hit_lgtm = False
+    hit_ko = False
+    for comment in comments:
+        body = comment.get("body") or ""
+        if MARKER in body:
+            # Skip the bot's own "Ready to test" comment — its body mentions
+            # LGTM/KO as instructions and would otherwise self-trigger.
+            continue
+        if KO_RE.search(body):
+            hit_ko = True
+        if LGTM_RE.search(body):
+            hit_lgtm = True
+
+    if hit_ko:
+        return "KO"
+    if hit_lgtm:
+        return "LGTM"
+    return "PENDING"
+
+
+def main() -> int:
+    if len(sys.argv) != 2:
+        print("usage: pr_lgtm_scanner.py <comments_json>", file=sys.stderr)
+        return 2
+    print(decide(sys.argv[1]))
+    return 0
+
+
+if __name__ == "__main__":
+    sys.exit(main())