docs: add universal org-level specs.md

[cloudygetty-ai]

Summary

• Adds specs.md — the CLOUDYGETTY-AI Universal GOD-MODE Specifications (Sentinel Engine v6.0 · ENTROPY-ZERO)
• Covers universal stack, aesthetic system, auth patterns, env validation, rate limiting, health endpoints, Prisma, Express, Docker, Fly.io, GitHub Actions, error boundaries, API client, Zustand store, Socket.io, S3, Stripe, push notifications, location, telemetry, security/performance checklists, and repo-specific overrides
• Applies org-wide; every repo gets this file as the single source of truth

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