fix(orchestrator): P7a NameError in P7 KEEP_OPEN guard

P7 Patch B used `comments[-1]` at line 1868 but `comments` is defined
inside run_stage, not run_issue scope. The KEEP_OPEN guard runs after
run_stage returns, where `comments` is no longer in scope, causing
NameError crash after Stage 6 YES was already accepted and exit report
generated.

Fix: fetch comments fresh via get_comments(n) at the guard entry.
exit_path file check (fallback) still works as designed.

Refs: #84 (Stage 6 crash during normal close path)

orchestrator.py

@@ -1865,7 +1865,12 @@ def run_issue(n, until=None):
                 r"NO\s+close\s+signal",
             ]
             keep_open = False
-            last_body = comments[-1].get("body", "") if comments else ""
+            # P7a (2026-05-26) — fetch comments fresh; `comments` is loop-local in stage block
+            # and not in scope at run_issue post-stage update. NameError fix.
+            try:
+                _cs = get_comments(n)
+                last_body = _cs[-1].get("body", "") if _cs else ""
+            except: last_body = ""
             for p in keep_open_patterns:
                 if re.search(p, last_body, re.IGNORECASE | re.MULTILINE):
                     keep_open = True; break