Update CLAUDE.md: add supported-languages section and AGENTS.md/GEMINI.md symlinks #191

Summary

The root CLAUDE.md agent guide currently documents only working-style rules and auxiliary tasks — it has no section describing what the SDK actually supports. As languages are added, there's no canonical place in the guide to record them, and adding a language has no obvious doc to update.

Requested changes

1. Add a "Supported languages" section to CLAUDE.md enumerating each wired language, its CLDK.<lang>() entry point, its backends (local codeanalyzer + optional read-only Neo4j), and where its models live. Current set: java, python, typescript, c.
2. Add AGENTS.md and GEMINI.md as relative symlinks to CLAUDE.md at the repo root, so Claude Code, the generic-agent convention, and Gemini all read one source of truth.

Why

Gives "add a language to the SDK" a single, obvious doc surface to extend, and brings the repo in line with the sibling analyzers' agent-guide convention (one CLAUDE.md, symlinked).