feat(server): Domain 2 Phase 1 — boocontext MCP client + 4 new code intelligence tools

Shared boocontext MCP client (boocontext_client.ts) wrapping the existing
mcp-client.ts callTool() infrastructure with 32KB truncation and error
handling. Used by get_code_health.

4 new first-class agent tools backed by the boocontext MCP server:
- get_code_health — A-F grades per file across 7 dimensions, project health
  summary, refactoring candidates (wraps boocontext_health)
- get_code_impact — merged symbol trace + blast radius in one call (wraps
  boocontext_impact, replaces two-step get_symbol_info+get_blast_radius)
- get_type_info — TypeScript type recovery via type-inject MCP (wraps
  boocontext_types, returns signatures, interfaces, generics, JSDoc)
- get_code_map — DCP-compressed context map with compress toggle (wraps
  boocontext_map, 10x token reduction vs full scan)

All 4 registered in ALL_TOOLS as read-only tools.

apps/server/src/services/tools/codecontext/index.ts

@@ -13,3 +13,8 @@ export { getBlastRadius } from './get_blast_radius.js';
 export { getHotFiles } from './get_hot_files.js';
 export { getRoutes } from './get_routes.js';
 export { getMiddleware } from './get_middleware.js';
+// v2.8.14-domain2-phase1: boocontext-backed tools.
+export { getCodeHealth } from './get_code_health.js';
+export { getCodeImpact } from './get_code_impact.js';
+export { getTypeInfo } from './get_type_info.js';
+export { getCodeMap } from './get_code_map.js';