refactor: codebase audit cleanup — dead code, dedup, module splits

Multi-agent audit + aggressive cleanup across server/web/coder/booterm,
delivered behind a DEFER discipline so none of the in-flight files were
touched. Removes dead code/deps/columns, dedups server + coder helpers,
and splits the oversized modules (tools.ts, opencode-server.ts,
sentinel-summaries, turn.ts, TerminalPane.tsx) behind stable contracts.
Adds 78 parity/unit tests (server 587, coder 323); fixes two latent bugs
(ChatPane queue keys, FileViewerOverlay blank-line parity).

Intended tag: v2.7.12-audit-cleanup.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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

@@ -1,6 +1,5 @@
 import { z } from 'zod';
-import type { ToolDef } from '../../tools.js';
-import { callCodecontext, type CodecontextResponse } from '../../codecontext_client.js';
+import { makeCodecontextTool } from './factory.js';
 
 export const GetRoutesInput = z.object({
   framework: z.string().trim().optional(),
@@ -13,38 +12,26 @@ const DESCRIPTION =
   'with method, path, file, line number, and inferred tags (db, auth, cache). ' +
   'Optional framework filter narrows to "fastify" or "express".';
 
-export async function executeGetRoutes(
-  input: GetRoutesInputT,
-  projectPath: string,
-  fetcher: typeof fetch = fetch,
-): Promise<CodecontextResponse> {
-  const args: Record<string, unknown> = {};
-  if (input.framework) args.framework = input.framework;
-  return callCodecontext({ toolName: 'get_routes', args, projectPath }, fetcher);
-}
-
-export const getRoutes: ToolDef<GetRoutesInputT> = {
-  name: 'get_routes',
-  description: DESCRIPTION,
-  inputSchema: GetRoutesInput,
-  jsonSchema: {
-    type: 'function',
-    function: {
-      name: 'get_routes',
-      description: DESCRIPTION,
-      parameters: {
-        type: 'object',
-        properties: {
-          framework: {
-            type: 'string',
-            description: 'Filter to a specific framework: "fastify" or "express". Omit for all.',
-          },
+const { toolDef: getRoutes, execute: executeGetRoutes } =
+  makeCodecontextTool<GetRoutesInputT>({
+    name: 'get_routes',
+    schema: GetRoutesInput,
+    description: DESCRIPTION,
+    jsonParameters: {
+      type: 'object',
+      properties: {
+        framework: {
+          type: 'string',
+          description: 'Filter to a specific framework: "fastify" or "express". Omit for all.',
         },
-        additionalProperties: false,
       },
+      additionalProperties: false,
     },
-  },
-  async execute(input, projectRoot) {
-    return await executeGetRoutes(input, projectRoot);
-  },
-};
+    mapArgs: (input) => {
+      const args: Record<string, unknown> = {};
+      if (input.framework) args.framework = input.framework;
+      return args;
+    },
+  });
+
+export { getRoutes, executeGetRoutes };