Add a language to CodeGraph

Wire a new tree-sitter language into codegraph's extraction pipeline, prove it extracts real symbols on popular repos, and prove it beats no-codegraph for an agent. Runs fully autonomously — pick repos, benchmark, update docs, then report. Never commit, push, publish, or tag (house rule); leave all changes for the user to review.

The argument is the language token used throughout the Language union, e.g. lua, elixir, zig. If none was given, ask which language. Use the lowercase single-token form everywhere (csharp, not c#).

Prerequisites

• Run from the codegraph repo root. node, git, gh, and a logged-in claude CLI (the benchmark spawns real claude -p runs).
• The benchmark uses the local dev build — Step 8 builds + links it on PATH.

Workflow