docs: drop Rust toolchain claim from CLAUDE.md and top-level Makefile

The AI/MCP tier (PROXYSQLGENAI=1) no longer requires rustc/cargo after
the sqlite-rembed removal. Follow-up to the preceding cleanup commits
to keep the user-facing tier documentation honest.

CLAUDE.md

@@ -40,7 +40,7 @@ The same codebase produces three product tiers via feature flags:
 |------|------|---------|------|
 | Stable | (default) | v3.0.x | Core proxy |
 | Innovative | `PROXYSQL31=1` | v3.1.x | FFTO, TSDB |
-| AI/MCP | `PROXYSQLGENAI=1` | v4.0.x | GenAI, MCP, Anomaly Detection (requires Rust toolchain) |
+| AI/MCP | `PROXYSQLGENAI=1` | v4.0.x | GenAI, MCP, Anomaly Detection |
 
 `PROXYSQLGENAI=1` implies `PROXYSQL31=1`, which implies `PROXYSQLFFTO=1` and `PROXYSQLTSDB=1`.
 

Makefile

@@ -52,7 +52,6 @@ lint: lint-generate-cdb lint-run
 ###      * MCP (Model Context Protocol) stack
 ###      * Advanced Anomaly Detection
 ###    - Automatically increments the major version (e.g., 3.0.6 -> 4.0.6).
-###    - Note: This tier requires the Rust toolchain for certain dependencies.
 ###
 ### HIERARCHY: `PROXYSQLGENAI=1` implies `PROXYSQL31=1`.