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_middleware.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 GetMiddlewareInput = z.object({});
 export type GetMiddlewareInputT = z.infer<typeof GetMiddlewareInput>;
@@ -11,31 +10,17 @@ const DESCRIPTION =
   'import names (@fastify/cors, helmet, etc.) and registration patterns ' +
   '(app.register, app.addHook, app.setErrorHandler).';
 
-export async function executeGetMiddleware(
-  _input: GetMiddlewareInputT,
-  projectPath: string,
-  fetcher: typeof fetch = fetch,
-): Promise<CodecontextResponse> {
-  return callCodecontext({ toolName: 'get_middleware', args: {}, projectPath }, fetcher);
-}
-
-export const getMiddleware: ToolDef<GetMiddlewareInputT> = {
-  name: 'get_middleware',
-  description: DESCRIPTION,
-  inputSchema: GetMiddlewareInput,
-  jsonSchema: {
-    type: 'function',
-    function: {
-      name: 'get_middleware',
-      description: DESCRIPTION,
-      parameters: {
-        type: 'object',
-        properties: {},
-        additionalProperties: false,
-      },
+const { toolDef: getMiddleware, execute: executeGetMiddleware } =
+  makeCodecontextTool<GetMiddlewareInputT>({
+    name: 'get_middleware',
+    schema: GetMiddlewareInput,
+    description: DESCRIPTION,
+    jsonParameters: {
+      type: 'object',
+      properties: {},
+      additionalProperties: false,
     },
-  },
-  async execute(input, projectRoot) {
-    return await executeGetMiddleware(input, projectRoot);
-  },
-};
+    mapArgs: () => ({}),
+  });
+
+export { getMiddleware, executeGetMiddleware };