docs: add Ghost theme migration task (Casper→Source)

Session 36 spent 2+ hours fighting Casper CSS specificity issues.
Even html body .class element !important gets overridden.
Gemini recommends migrating to Source theme (official, minimal, dev-friendly).
Task includes complete migration plan with rollback strategy.

docs/tasks/ghost-theme-migration/README.md

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+# Task: Migrate from Casper to Source Theme
+
+## Priority: HIGH
+**Reason:** Current Casper theme creates CSS specificity battles that waste hours per session. Even `!important` rules with high specificity get overridden.
+
+## Problem Statement
+Casper theme has opinionated CSS architecture that:
+- Overrides custom CSS even with `html body .class element !important` specificity
+- Fights full-width layouts with rigid `.gh-canvas` grid system
+- Requires inline `!important` on every font-size property as workaround
+- Makes future customization painful and time-consuming
+
+**Evidence:** Session 36 spent 2+ hours debugging why `html body .ffg-custom-text h2 { font-size: 4rem !important; }` was overridden by Casper's base `h2 { font-size: 2.8rem; }` rule despite lower specificity.
+
+## Recommended Solution
+Migrate to **Source theme** (official Ghost theme)
+
+**Why Source:**
+- Official Ghost core team theme
+- Minimal CSS opinions, designed as blank canvas
+- Guaranteed compatibility with Ghost updates
+- HTML cards span naturally without grid constraints
+- Uses CSS variables for easy theming
+
+**Alternatives considered:**
+- Ghost Starter Theme (too bare, requires building everything)
+- Edition (newsletter-focused, less suitable for gaming community)
+
+## Migration Process (Zero Downtime)
+
+### Pre-Migration Backup
+1. **Backup current Casper fork:**
+   - Ghost Admin → Settings → Design & Branding → Customize
+   - Click Advanced (top right) → Download
+   - Store in /home/claude/ghost-backups/casper-fork-YYYY-MM-DD.zip
+
+2. **Backup site content:**
+   - Settings → Labs → Export your content
+   - Save JSON file to /home/claude/ghost-backups/content-YYYY-MM-DD.json
+
+3. **Backup routes:**
+   - Settings → Labs → Routes → Download current routes.yaml
+   - Save to /home/claude/ghost-backups/routes-YYYY-MM-DD.yaml
+
+### CSS Variable Setup
+**BEFORE activating new theme**, add Fire/Frost branding variables to Site Header:
+
+:root {
+    /* Fire/Frost Brand Colors */
+    --ffg-teal: #4ecdc4;
+    --ffg-orange: #ff6b35;
+    --ffg-purple: #a855f7;
+    --ffg-gold: #FFD700;
+    
+    /* Backgrounds */
+    --ffg-bg-dark: #0f0f1e;
+    --ffg-bg-darker: #0a0a1a;
+    
+    /* Typography */
+    --ffg-text-primary: #ffffff;
+    --ffg-text-secondary: #a8dadc;
+    --ffg-text-tertiary: #6b7280;
+}
+
+### Theme Installation
+1. Download Source theme: https://github.com/TryGhost/Source
+2. Upload to Ghost: Settings → Design & Branding → Change Theme → Upload Theme
+3. Click Preview button (not Activate)
+
+### QA Checklist (In Preview Mode)
+- [ ] Section 1 (Hero) - full width, logo visible, text readable
+- [ ] Section 2 (Choose Your Destiny) - cards display properly
+- [ ] Section 3 (Why Firefrost) - 3-column grid intact
+- [ ] Section 4 (Community Awaits) - stats display correctly
+- [ ] Section 5 (Origin Story) - text formatting preserved
+- [ ] Footer - all 3 columns, social links visible
+
+### Activation
+1. Click Activate in theme preview
+2. Open incognito window
+3. Visit firefrostgaming.com and hard refresh
+
+### Post-Migration Cleanup
+1. Refactor homepage HTML sections - remove all inline font-size: X !important
+2. Consolidate CSS in Site Header injection
+3. Test responsiveness on mobile/tablet
+
+### Rollback Plan
+1. Settings → Design & Branding → Change Theme → Upload backed-up Casper fork
+2. Activate immediately
+
+## Success Criteria
+- [ ] Homepage renders identically to current Casper version
+- [ ] Custom CSS applies without inline !important workarounds
+- [ ] Typography sizes match design (4rem h2, 2.5rem h3, etc.)
+- [ ] Full-width layout works without right-shift
+- [ ] Zero downtime during migration
+
+## Estimated Time: ~2 hours
+
+---
+**Created:** Session 36 (The Chronicler #36)
+**Status:** PENDING