chore: update CLAUDE.md for docker-only standard-tooling (#448)

Standard-tooling CLI tools are now pre-installed in the dev container
images. Remove manual uv sync and PATH setup; keep git hooks config.

Closes #177
Ref vergil-project/vergil-tooling#213

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: wphillipmoore

CLAUDE.md

@@ -18,11 +18,12 @@ This file provides guidance to Claude Code (claude.ai/code) when working with co
 ### Standard Tooling
 
 ```bash
-cd ../standard-tooling && uv sync                                                # Install standard-tooling
-export PATH="../standard-tooling/.venv/bin:../standard-tooling/scripts/bin:$PATH" # Put tools on PATH
-git config core.hooksPath ../standard-tooling/scripts/lib/git-hooks               # Enable git hooks
+git config core.hooksPath ../standard-tooling/scripts/lib/git-hooks  # Enable git hooks
 ```
 
+Standard-tooling CLI tools (`st-commit`, `st-validate-local`, etc.) are
+pre-installed in the dev container images. No local setup required.
+
 ### Environment Setup
 
 ```bash