Fix ShellCheck SC2286 in keygen script to unblock Linting Summary job

[Copilot]

The Linting Summary GitHub Actions job was failing because ShellCheck Analysis & Suggestions reported one error-level finding (SC2286), which causes the summary job to exit non-zero. This change removes that error at the source in scripts/lib/keygen.sh.

• Root cause

  • scripts/lib/keygen.sh used an empty-string fallback as a command after command substitution:
    • ... ) || ""
  • ShellCheck flags this as SC2286 (“empty string interpreted as command name”).

• Targeted fix

  • Replaced the invalid fallback command with a no-op success fallback:
    • ... ) || true
  • This preserves existing behavior (ignore command-substitution failure and continue with explicit downstream KEY_ID emptiness check) while eliminating the lint error.

• Code change

  # before
  KEY_ID=$(gpg --list-secret-keys --keyid-format LONG "$EMAIL" 2>/dev/null | awk '/^sec/ {print $2}' | cut -d'/' -f2 | head -n 1) || ""
  
  # after
  KEY_ID=$(gpg --list-secret-keys --keyid-format LONG "$EMAIL" 2>/dev/null | awk '/^sec/ {print $2}' | cut -d'/' -f2 | head -n 1) || true

[xaoscience]

Happy happy happy!