v1.16.0-codesight-merge: 4 new codecontext tools — blast radius, hot files, routes, middleware

BooCode wrapper tools for the 4 new MCP tools added to the codecontext
sidecar (Go side committed separately at /opt/forks/codecontext).

- get_blast_radius: reverse-edge BFS — "what breaks if I change this?"
- get_hot_files: most-imported files by incoming edge count
- get_routes: Fastify/Express route extraction via tree-sitter AST
- get_middleware: middleware detection via import + registration patterns

Wrappers follow the existing codecontext pattern: Zod input → callCodecontext
→ ToolDef export. Registered in ALL_TOOLS (alpha-sorted). All 4 are read-only.

codecontext sidecar rebuilt from commit b19e646 with the 4 new Go handlers
(2130 lines, 29 tests). Reviewer fixes applied: defer RUnlock on Tier 2
handlers, extractObjectProperty delegates to extractStringValue for
template-literal route paths.

363/363 server tests passing. No schema changes, no frontend changes.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

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

@@ -0,0 +1,50 @@
+import { z } from 'zod';
+import type { ToolDef } from '../../tools.js';
+import { callCodecontext, type CodecontextResponse } from '../../codecontext_client.js';
+
+export const GetHotFilesInput = z.object({
+  limit: z.number().int().min(1).max(100).optional(),
+});
+export type GetHotFilesInputT = z.infer<typeof GetHotFilesInput>;
+
+const DESCRIPTION =
+  'Returns the most-imported files in the project, ranked by incoming import count. ' +
+  'Hot files are high-risk change targets — many other files depend on them. ' +
+  'Use to identify core modules and assess refactoring risk.';
+
+export async function executeGetHotFiles(
+  input: GetHotFilesInputT,
+  projectPath: string,
+  fetcher: typeof fetch = fetch,
+): Promise<CodecontextResponse> {
+  return callCodecontext(
+    { toolName: 'get_hot_files', args: input.limit != null ? { limit: input.limit } : {}, projectPath },
+    fetcher,
+  );
+}
+
+export const getHotFiles: ToolDef<GetHotFilesInputT> = {
+  name: 'get_hot_files',
+  description: DESCRIPTION,
+  inputSchema: GetHotFilesInput,
+  jsonSchema: {
+    type: 'function',
+    function: {
+      name: 'get_hot_files',
+      description: DESCRIPTION,
+      parameters: {
+        type: 'object',
+        properties: {
+          limit: {
+            type: 'number',
+            description: 'Maximum number of files to return (default 20, max 100).',
+          },
+        },
+        additionalProperties: false,
+      },
+    },
+  },
+  async execute(input, projectRoot) {
+    return await executeGetHotFiles(input, projectRoot);
+  },
+};