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. Complete theme reskin with:

- CSS token system (brand.css) with Teal/Lime/Orange palette
- Poppins/Inter/IBM Plex Mono font loading
- Full favicon/PWA/OG asset pack
- 5-state verdict badge + card + evidence row components
- verdict_state post meta on pr_peptide CPT with meta box
- Affiliate disclosure component (3 contexts: inline, banner, footer)
- How we review peptides page template
- About & Editorial Standards page template
- Footer Our Method links + disclosure
- SVG logo support (logo-horizontal.svg inline)
- OG image fallback meta tag
- Accessibility: role=img on badges, skip-to-content link, prefers-reduced-motion support

Theme version bumped to 2.0.0-alpha.1.

site.webmanifest

@@ -0,0 +1,14 @@
+{
+  "name": "Peptide Repo",
+  "short_name": "Peptide Repo",
+  "description": "What the research really says — verdict-driven peptide science.",
+  "start_url": "/",
+  "scope": "/",
+  "display": "standalone",
+  "background_color": "#FAFAF7",
+  "theme_color": "#1B8A92",
+  "icons": [
+    {"src": "/wp-content/themes/peptide-starter/assets/brand/icon-192.png", "sizes": "192x192", "type": "image/png", "purpose": "any maskable"},
+    {"src": "/wp-content/themes/peptide-starter/assets/brand/icon-512.png", "sizes": "512x512", "type": "image/png", "purpose": "any maskable"}
+  ]
+}