fix: CMO walkthrough P1 fixes — verdict_text, per-row glyphs, conditional disclosure, dark mode (v2.0.0-alpha.3)

P1.1: verdict_text meta field + card.php wiring
- Register verdict_text (textarea, show_in_rest) on peptide CPT
- card.php reads verdict_text meta; falls back to placeholder if empty
- Hardcoded generic placeholder no longer the default for published posts
- All 3 monographs populated with CMO-authored verdict text

P1.2: per-row glyph meta fields
- Register signal_row_1/2/3_glyph (enum: ✓|!|?|⊘|⚠, show_in_rest)
- card.php reads per-row glyph from meta instead of hardcoding by position
- Missing glyph renders nothing (not a wrong glyph)
- Semaglutide: ✓✓! | BPC-157: ✓!? | Melanotan-II: !!⚠

P1.3: conditional inline disclosure
- Register has_partner_link (boolean, default false, show_in_rest)
- single-peptide.php only renders inline disclosure when has_partner_link=true
- All 3 loaded monographs set to has_partner_link=false
- Footer disclosure unaffected (always renders)

N.1: dark mode toggle hidden
- header.php: toggle button hidden (display:none + aria-hidden)
- Dark-mode verdict colors not validated for v1; re-enable in v1.1

Meta box updated with textarea, glyph dropdowns, and partner-link checkbox.

header.php

@@ -118,7 +118,8 @@
 			</button>
 
 			<!-- Dark Mode Toggle -->
-			<button class="header-icon-btn dark-mode-toggle" aria-label="<?php esc_attr_e( 'Toggle dark mode', 'peptide-starter' ); ?>">
+			<!-- Dark mode disabled for v1: verdict-color accessibility only validated for light mode. Re-enable in v1.1 after dark palette audit. -->
+			<button class="header-icon-btn dark-mode-toggle" aria-label="<?php esc_attr_e( 'Toggle dark mode', 'peptide-starter' ); ?>" style="display:none;" aria-hidden="true">
 				<svg class="sun-icon" width="20" height="20" viewBox="0 0 20 20" fill="none" xmlns="http://www.w3.org/2000/svg" style="display: none;">
 					<circle cx="10" cy="10" r="4" stroke="currentColor" stroke-width="2"/>
 					<path d="M10 1V3M10 17V19M19 10H17M3 10H1M16.657 16.657L15.243 15.243M4.757 4.757L3.343 3.343M16.657 3.343L15.243 4.757M4.757 15.243L3.343 16.657" stroke="currentColor" stroke-width="2" stroke-linecap="round"/>