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.

assets/brand/logo-mark.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 80 80" role="img" aria-label="Peptide Repo">
+  <rect x="0" y="0" width="72" height="72" rx="14" fill="#1B8A92"/>
+  <text x="36" y="51" text-anchor="middle" font-family="Poppins, sans-serif" font-weight="700" font-size="34" fill="#FFFFFF" letter-spacing="0.5">PR</text>
+  <circle cx="66" cy="66" r="13" fill="#7FD600"/>
+  <path d="M 60.5 66.5 l 3.5 3.5 l 7.5 -7.5" stroke="#0D0D0D" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" fill="none"/>
+</svg>