fix(ci): indent python3 -c body so YAML block scalar parses

The python3 inline script in wait-approval was written at column 0 (lines 257-283), but YAML block scalars require content to be more indented than the parent key. YAML exited the run: | block at the first column-0 line ("import json, re, sys") and tried to parse the python as YAML, failing with "could not find expected :" at line 257 — which prevented pr-iphone-deploy.yml from running at all (no run was ever created for PRs that touched only the workflow file).

Fix: switch to python3 -c with the body indented to sit inside the run: | block scalar.

Verified locally:
  - yaml.safe_load parses the workflow cleanly (jobs: changes, build-deploy, wait-approval).
  - The extracted python, run exactly as act will execute it, returns:
      bot-only            -> PENDING  (was self-merging before)
      bot + reviewer LGTM -> LGTM     (squash-merge still fires)
      bot + reviewer KO   -> KO       (block still fires)

.github/workflows/pr-iphone-deploy.yml

@@ -253,34 +253,33 @@ 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
-)
+            DECISION=$(python3 -c '
+              import json, re, sys
+              MARKER = "<!-- tabatago:ready-to-test -->"
+              try:
+                  comments = json.loads(sys.argv[1] or "[]")
+              except Exception:
+                  comments = []
+              lgtm = re.compile(r"\bLGTM\b", re.IGNORECASE)
+              ko    = re.compile(r"\bKO\b",   re.IGNORECASE)
+              hit_lgtm = hit_ko = False
+              for c in comments:
+                  body = c.get("body") or ""
+                  if MARKER in body:
+                      # Skip bot comments — their body contains LGTM/KO as reviewer
+                      # instructions and would otherwise self-trigger a merge.
+                      continue
+                  if ko.search(body):
+                      hit_ko = True
+                  if lgtm.search(body):
+                      hit_lgtm = True
+              if hit_ko:
+                  print("KO")
+              elif hit_lgtm:
+                  print("LGTM")
+              else:
+                  print("PENDING")
+              ' "$COMMENTS")
 
             case "$DECISION" in
               LGTM)