feat(server): add boocontext deep analysis tools and synthesis pipeline

- get_symbol_details: type signature, definition location, usage count
- get_call_graph: callers, callees, transitive references
- get_blast_radius added to SYNTHESIS_TOOLS

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

@@ -0,0 +1,31 @@
+import { z } from 'zod';
+import { makeCodecontextTool } from './factory.js';
+
+export const GetCallGraphInput = z.object({
+  symbol: z.string().describe('Symbol name to analyze'),
+  depth: z.number().int().min(1).max(5).optional().describe('Max traversal depth (default 2)'),
+});
+export type GetCallGraphInputT = z.infer<typeof GetCallGraphInput>;
+
+const DESCRIPTION =
+  'Returns a call graph for a function or method: callers, callees, and transitive references. ' +
+  'Use to understand how a symbol is invoked and what it depends on.';
+
+const { toolDef: getCallGraph, execute: executeGetCallGraph } =
+  makeCodecontextTool<GetCallGraphInputT>({
+    name: 'get_call_graph',
+    schema: GetCallGraphInput,
+    description: DESCRIPTION,
+    jsonParameters: {
+      type: 'object',
+      properties: {
+        symbol: { type: 'string', description: 'Symbol name to analyze' },
+        depth: { type: 'number', description: 'Max traversal depth (default 2)' },
+      },
+      required: ['symbol'],
+      additionalProperties: false,
+    },
+    mapArgs: (input) => ({ symbol: input.symbol, depth: input.depth ?? 2 }),
+  });
+
+export { getCallGraph, executeGetCallGraph };