Redesign Codex integration: auditor + coder architecture

Update plan with Phase 1 progress, update Supabase project ID references

Add credentials.md and vercel.env to .gitignore

Add SPA rewrite rule for Vercel routing

Remove vercel.json — root directory set via Vercel UI instead

Add vercel.json to set root directory to pubzub

Update domain references from pubzub.app to pubzub.com

Add PubZub publication pipeline manager (Phase 1: platform independence)

Redesign EconGuru: 3 methodology gurus, Codex integration, remove rating system

Update README: revise EconGuru description, add TannieDi

Remove kabbo skill

Redesign EconGuru: independent guru agents with persistent library

Add Part V: The Wind's Words — |Xam closing quotes for kabbo

Make kabbo data path configurable, rename workflow-tracker to kabbo

Trim kabbo skill: 999 → 433 lines, remove duplications