feat: brand identity v1.0.0 — Direction C Trusted Guide (theme v2.0.0-alpha.1)

Implements weeks 1–4 of the CMO brand identity sprint.

Key changes:
- CSS token system (assets/css/brand.css): full palette, verdict tokens, component styles
- Poppins/Inter/IBM Plex Mono Google Fonts loading with preload
- Full favicon/PWA/OG asset pack (peptide-repo-brand v1.0.0)
- 5-state verdict badge + card + evidence row components
- verdict_state + signal_row post meta on pr_peptide CPT
- Homepage hero: teal bg, new H1/subhead, lime search bar
- Archive verdict filter chips (CSS + pre_get_posts query hook)
- Affiliate disclosure component (3 contexts)
- page-how-we-review.php + page-about.php templates
- Footer Our Method links
- a11y: skip-to-content, reduced-motion, aria on verdict badges

QA: PASS (0 blockers) — qa-reviews/peptide-starter-theme/2026-04-26-a2bff59.md
Staging verified: https://staging.peptiderepo.com

inc/helpers.php

@@ -136,6 +136,15 @@ function peptide_starter_the_custom_logo() {
 		the_custom_logo();
 		return;
 	}
+	// Use SVG logo if available
+	$logo_path = get_template_directory() . '/assets/brand/logo-horizontal.svg';
+	if ( file_exists( $logo_path ) ) {
+		echo '<a class="site-logo" href="' . esc_url( home_url( '/' ) ) . '" rel="home" aria-label="' . esc_attr( get_bloginfo( 'name' ) ) . '">';
+		include $logo_path;
+		echo '</a>';
+		return;
+	}
+	// Fallback to text
 	$site_name = get_bloginfo( 'name' );
 	echo '<a class="site-logo" href="' . esc_url( home_url( '/' ) ) . '" rel="home">' . esc_html( $site_name ) . '</a>';
 }