fix(release): repair functions.php + ARCHITECTURE.md truncations from prior commit

The prior commit (4a506e1c) was assembled from a sandbox bash mount that
returned a truncated view of two files. Net effect:
  - functions.php was cut at line 235, dropping the closing of
    peptide_starter_inline_dark_mode_script() and its add_action
    registration. wp_head dark-mode script was effectively removed.
  - ARCHITECTURE.md was cut mid-paragraph and lost its Version section.

Both files are now rebuilt from main + minimum-delta patches:
  - functions.php: +4 minimal additions (perf-asset-policy @see, version
    bump, require_once, add_action). Dark-mode script preserved.
  - ARCHITECTURE.md: +3 lines (perf-asset-policy in inc/ tree, version
    banner bumped). Version section preserved.
  - style.css, CHANGELOG.md, CONVENTIONS.md: also rebuilt from main +
    targeted patches as a safety measure (no functional change vs the
    prior commit, just guaranteed-untruncated).

Verified: every file ends with a trailing newline; functions.php contains
the dark-mode add_action; ARCHITECTURE.md contains the Version section.

Co-authored-by: Engineer Theme (in-session subagent) <engineer-theme@peptiderepo.users.noreply.github.com>

functions.php

@@ -233,4 +233,11 @@ function peptide_starter_inline_dark_mode_script() {
 		var html = document.documentElement;
 		var stored = localStorage.getItem('peptide-starter-theme');
 		var defaultTheme = <?php echo wp_json_encode( $default_dark ); ?>;
-		var systemDark = window.matchMedia('(prefers-col
+		var systemDark = window.matchMedia('(prefers-color-scheme: dark)').matches;
+		var theme = stored || (systemDark ? 'dark' : defaultTheme);
+		html.setAttribute('data-theme', theme);
+	})();
+	</script>
+	<?php
+}
+add_action( 'wp_head', 'peptide_starter_inline_dark_mode_script' );