wp help currently rewrites Markdown links in command descriptions into numbered footnotes. This change adds terminal hyperlink rendering (OSC 8) when supported, while preserving existing footnote output as the compatibility path.

• Help link rendering behavior

  • Updated Help_Command::parse_reference_links() to choose between:
    • OSC 8 hyperlinks in-place ([label](url) → clickable label)
    • Existing footnote transformation ([label][n] + --- footnotes)
  • Keeps the change scoped to description text before section headers, matching current parsing boundaries.

• Terminal capability + env override

  • Added supports_hyperlinks() detection logic for hyperlink-capable terminals, aligned more closely with supports-hyperlinks.
  • Added FORCE_HYPERLINK override handling:
    • numeric values: > 0 enables, 0 disables
    • non-empty string enables
  • Added create_hyperlink($url, $text) helper to centralize OSC 8 sequence generation.
  • Extended terminal detection support, including:
    • TERM_PROGRAM: ghostty, zed, WezTerm, vscode (with Cursor support)
    • TERM: alacritty, xterm-kitty
    • expanded VTE_VERSION parsing and handling

• Targeted test coverage

  • Existing HelpTest::test_parse_reference_links() is pinned to legacy behavior with FORCE_HYPERLINK=0.
  • Added test_parse_reference_links_with_forced_hyperlinks() to validate forced OSC 8 output.

if ( self::supports_hyperlinks() ) {
    return self::create_hyperlink( $url, $label );
}

// fallback: [label][1] + footnotes