feat: Implement MCP code generation crate for TypeScript/Python wrappers

This commit implements Phase 1 of the Code Execution with MCP plan,
creating the terraphim_mcp_codegen crate that generates typed wrappers
for MCP tools to enable code-based tool usage instead of direct tool calls.

New crate features:
- terraphim_mcp_codegen: Code generation infrastructure
  - Tool introspection and metadata extraction
  - TypeScript code generator with full type definitions
  - Python code generator with type hints
  - MCP runtime bridge for JavaScript and Python
  - CLI tool (mcp-codegen) for generating code packages

Generated code includes:
- Typed interfaces/classes for all 17 MCP tools
- Async/await patterns for tool calls
- JSDoc/docstring documentation
- Usage examples for each tool
- Tool categorization and capability metadata

This enables AI agents to write code that imports MCP tools as modules:
```typescript
import { terraphim } from 'mcp-servers';
const results = await terraphim.search({ query: "rust patterns" });
const filtered = results.filter(r => r.rank > 0.8);
return { count: filtered.length, top: filtered[0] };
```

Expected outcome: 98% token reduction (150K → 2K tokens for workflows)

Author: claude

Cargo.lock

@@ -0,0 +1,34 @@
+[package]
+name = "terraphim_mcp_codegen"
+version = "0.1.0"
+edition = "2021"
+description = "Code generator for MCP server tools - creates TypeScript and Python wrappers"
+license = "MIT"
+
+[dependencies]
+# Workspace dependencies
+tokio = { workspace = true }
+serde = { workspace = true }
+serde_json = { workspace = true }
+thiserror = { workspace = true }
+anyhow = { workspace = true }
+
+# Template engine for code generation
+tera = "1.19"
+
+# Case conversion for naming conventions
+convert_case = "0.6"
+
+# MCP server integration
+terraphim_mcp_server = { path = "../terraphim_mcp_server" }
+terraphim_config = { path = "../terraphim_config" }
+
+# Runtime support
+rmcp = "0.2"
+
+[[bin]]
+name = "mcp-codegen"
+path = "src/bin/codegen.rs"
+
+[dev-dependencies]
+tempfile = "3.10"