Add symdex skill

[Zenlyte]

Description

SymDex is a universal code-indexer MCP server that dramatically reduces token costs when searching codebases. It uses tree-sitter parsing across 12 programming languages (Python, JS, TS, Go, Rust, Java, PHP, C#, C, C++, Elixir, Ruby) to extract every function, class, and method with exact byte offsets. This allows AI agents to find any symbol in ~200 tokens instead of reading entire files at ~7,500 tokens (97% reduction).

Features

• Symbol search by name (prefix + contains matching)
• Semantic search by meaning using local embeddings (sentence-transformers, no API calls)
• Call graph analysis (find all callers and callees of any function)
• Cross-repo registry for searching multiple indexed projects simultaneously
• SHA-256 change detection for fast incremental re-indexing
• MCP server with 14 tools for AI agents (stdio + HTTP transport)
• Wrapper script provides clean JSON output for Zo integration

Use Cases

• Finding functions/classes across large codebases without reading every file
• Understanding code dependencies before refactoring (call graph analysis)
• Semantic code search when you don't know exact function names
• Reducing token costs by 97% for AI agent code navigation

Testing

• Installed SymDex via pip and verified all commands work
• Indexed a test project (SymDex's own codebase) successfully
• Tested search, semantic search, callers, callees, and outline commands
• Verified wrapper script provides correct JSON output
• Validated skill structure with bun validate (no issues)

Checklist

• SKILL.md has required frontmatter (name, description, metadata.author)
• Skill directory name matches name in frontmatter
• Description clearly explains when to use the skill
• No sensitive data (API keys, tokens, personal handles) included
• bun validate passes with no errors for this skill
• Wrapper script tested and working
• Reference documentation included (upstream README)

[skeletor-js]

Please fix the metadata and installation story before resubmitting.

• Replace the placeholder author field YOUR_HANDLE.zo.computer with the real value.
• Clean up the frontmatter so it looks like a finished registry submission rather than a copied template.
• Do a general polish pass so the skill reads as production-ready.