fix: add python3 shebang to bin/glitch_patterns.py (#681)

bin/glitch_patterns.py:
  Added #!/usr/bin/env python3 as first line
  (was the only file from the issue list missing a shebang)

Other files listed in #681 already have shebangs:
  bin/nostr-agent-demo.py    ✓
  bin/soul_eval_gate.py      ✓
  scripts/captcha_bypass_handler.py ✓
  scripts/diagram_meaning_extractor.py ✓
  scripts/visual_pr_reviewer.py ✓

tests/test_shebangs.py: 2 tests + 17 subtests
  Verifies all issue-listed files have shebangs
  Verifies all bin/*.py files have shebangs

bin/glitch_patterns.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """
 Glitch pattern definitions for 3D world anomaly detection.
 

tests/test_shebangs.py

@@ -0,0 +1,53 @@
+"""
+Tests for #681 — Python scripts have shebangs.
+"""
+
+import os
+import unittest
+from pathlib import Path
+
+REPO_ROOT = Path(__file__).parent.parent
+
+# Files mentioned in issue #681
+ISSUE_FILES = [
+    "bin/glitch_patterns.py",
+    "bin/nostr-agent-demo.py",
+    "bin/soul_eval_gate.py",
+    "scripts/captcha_bypass_handler.py",
+    "scripts/diagram_meaning_extractor.py",
+    "scripts/visual_pr_reviewer.py",
+]
+
+
+class TestShebangs(unittest.TestCase):
+    def test_all_issue_files_have_shebangs(self):
+        """All files listed in #681 have #!/usr/bin/env python3 shebang."""
+        for relpath in ISSUE_FILES:
+            filepath = REPO_ROOT / relpath
+            with self.subTest(file=relpath):
+                self.assertTrue(filepath.exists(), f"{relpath} not found")
+                with open(filepath) as f:
+                    first_line = f.readline().strip()
+                self.assertEqual(
+                    first_line, "#!/usr/bin/env python3",
+                    f"{relpath} missing shebang, first line: {first_line}"
+                )
+
+    def test_bin_scripts_have_shebangs(self):
+        """All .py files in bin/ have shebangs."""
+        bin_dir = REPO_ROOT / "bin"
+        if not bin_dir.exists():
+            self.skipTest("bin/ not found")
+
+        for filepath in bin_dir.glob("*.py"):
+            with self.subTest(file=filepath.name):
+                with open(filepath) as f:
+                    first_line = f.readline().strip()
+                self.assertTrue(
+                    first_line.startswith("#!"),
+                    f"bin/{filepath.name} missing shebang"
+                )
+
+
+if __name__ == "__main__":
+    unittest.main()