Persistent Project Context for xAI Grok

Gives Grok persistent project context through IANA-registered .faf files instead of re-explaining your stack every session. Exposes scoring tools (faf_score, faf_validate, faf_get_tier) and memory operations over MCP, served from Cloudflare Workers at sub-millisecond cold starts via a 4865-byte Zig WASM engine. The hosted endpoint at mcpaas.live/grok/mcp/v1 covers read-only WASM tools, while the local bunx path handles filesystem mutations like faf_init and faf_sync. Includes refresh_faf to re-ground on live project DNA and refresh_fafm for memory layer drift detection. You add one URL to ~/.grok/config.toml and Grok stops guessing your architecture.