Prep v1 beta release: fix stale refs, counts, and add sponsorship links

- Fix agent count: 48 → 49 in README.md (2 locations)
- Fix skill count: 70 → 72 in README.md (5 locations)
- Remove non-existent agents (ml-engineer, deployment-engineer, database-admin) from CCGS Testing Framework docs
- Replace Ko-fi with Buy Me a Coffee (buymeacoffee.com/donchitos3)
- Add GitHub Sponsors (github.com/sponsors/Donchitos) badge and section
- Add Supporting This Project section to README with ToC entry

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

CCGS Skill Testing Framework/CLAUDE.md

@@ -52,7 +52,7 @@ directors   → creative-director, technical-director, producer, art-director
 leads       → lead-programmer, narrative-director, audio-director, ux-designer,
               qa-lead, release-manager, localization-lead
 specialists → gameplay-programmer, engine-programmer, ui-programmer,
-              tools-programmer, network-programmer, ml-engineer, ai-programmer,
+              tools-programmer, network-programmer, ai-programmer,
               level-designer, sound-designer, technical-artist
 godot       → godot-specialist, godot-gdscript-specialist, godot-csharp-specialist,
               godot-shader-specialist, godot-gdextension-specialist
@@ -60,9 +60,8 @@ unity       → unity-specialist, unity-ui-specialist, unity-shader-specialist,
               unity-dots-specialist, unity-addressables-specialist
 unreal      → unreal-specialist, ue-gas-specialist, ue-replication-specialist,
               ue-umg-specialist, ue-blueprint-specialist
-operations  → devops-engineer, deployment-engineer, database-admin,
-              security-engineer, performance-analyst, analytics-engineer,
-              community-manager
+operations  → devops-engineer, security-engineer, performance-analyst,
+              analytics-engineer, community-manager
 creative    → writer, world-builder, game-designer, economy-designer,
               systems-designer, prototyper
 ```