fix: add python3 shebangs to 6 scripts (#681)

Add #!/usr/bin/env python3 as first line to:
- 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

All scripts now executable directly (./script.py).
No functionality changes. Existing tests pass.

Closes #681

bin/glitch_patterns.py

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

bin/nostr-agent-demo.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """
 Full Nostr agent-to-agent communication demo - FINAL WORKING
 """

bin/soul_eval_gate.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 """
 Soul Eval Gate — The Conscience of the Training Pipeline
 

scripts/captcha_bypass_handler.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import json
 from hermes_tools import browser_navigate, browser_vision
 

scripts/diagram_meaning_extractor.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import json
 from hermes_tools import browser_navigate, browser_vision
 

scripts/visual_pr_reviewer.py

@@ -1,3 +1,4 @@
+#!/usr/bin/env python3
 import json
 from hermes_tools import browser_navigate, browser_vision