fix(lib): resolve B-8 send_keys_safe agy verification bypass and add submission retry test

tests/test_b8_send_keys_verification.py

@@ -0,0 +1,29 @@
+import os
+import subprocess
+import pytest
+
+def test_send_keys_safe_b8_verification(tmp_path):
+    """Verify that send_keys_safe for agy sessions goes through submission verification and does not return 0 blindly on failure."""
+    # Test script that mocks herdr commands and tests send_keys_safe behavior for agy
+    test_script = f"""#!/usr/bin/env bash
+set -euo pipefail
+SKILL_DIR="{os.path.abspath('.agents/skills')}"
+source "$SKILL_DIR/lib.sh"
+
+# Mock _pane_quiescent to succeed
+_pane_quiescent() {{ return 0; }}
+_pane_dialog_open() {{ return 1; }}
+
+# Mock _sks_herdr commands
+_sks_herdr() {{ return 0; }}
+
+# Mock _pane_capture to simulate fixed pane content (no execution token, no pane change)
+_pane_capture() {{ echo "static content"; }}
+
+# Running send_keys_safe for agy session when submission is NOT accepted
+send_keys_safe "test-workspace-creator-agy" "test prompt" "job-123"
+"""
+    res = subprocess.run(["bash", "-c", test_script], capture_output=True, text=True)
+    # Since submission failed after 3 tries (pane static, no token), it must return exit code 4 (not 0)
+    assert res.returncode == 4, f"Expected returncode 4 on submission failure for agy, got {res.returncode}. Output: {res.stdout} {res.stderr}"
+    assert "Enter not accepted after 3 tries" in res.stderr