fix(folio): word-bound the G2 ERROR scan and drop the dead objc allowlist glob

examples/folio/gates-testdata/g2-benign-only/output.log

@@ -1,4 +1,5 @@
 companion pid=4242 listening on 127.0.0.1:51000
 objc[4242]: Class FBSDKError is implemented in both /a (0x1) and /b (0x2). One of the two will be used. Which one is undefined.
 WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
+archived previous runs under runs/ERRORS_archive
 run complete

examples/folio/gates-testdata/g2-real-error/output.log

@@ -1,4 +1,5 @@
 companion pid=4242 listening on 127.0.0.1:51000
 objc[4242]: Class FBSDKError is implemented in both /a (0x1) and /b (0x2). One of the two will be used. Which one is undefined.
 WARNING: All log messages before absl::InitializeLog() is called are written to STDERR
+archived previous runs under runs/ERRORS_archive
 error: hierarchy fetch failed: companion connection lost

examples/folio/gates-testdata/generate.py

@@ -77,6 +77,9 @@ BENIGN_NOISE = [
     "objc[4242]: Class FBSDKError is implemented in both /a (0x1) and /b (0x2). "
     "One of the two will be used. Which one is undefined.\n",
     "WARNING: All log messages before absl::InitializeLog() is called are written to STDERR\n",
+    # An incidental ERROR substring inside a longer word: the G2 scan is
+    # word-bounded, so this must not trip the gate.
+    "archived previous runs under runs/ERRORS_archive\n",
 ]
 
 write_run("pass", healthy_steps())