refactor: wave 1 - extract leaf modules, rename catch-all files, split index.ts hooks

- Split 25+ index.ts files into hook.ts + extracted modules
- Rename all catch-all utils.ts/helpers.ts to domain-specific names
- Split src/tools/lsp/ into ~15 focused modules
- Split src/tools/delegate-task/ into ~18 focused modules
- Separate shared types from implementation
- 155 files changed, 60+ new files created
- All typecheck clean, 61 tests pass

src/tools/lsp/utils.test.ts

@@ -3,7 +3,7 @@ import { mkdirSync, mkdtempSync, rmSync, writeFileSync } from "fs"
 import { join } from "path"
 import os from "os"
 
-import { findWorkspaceRoot } from "./utils"
+import { findWorkspaceRoot } from "./lsp-client-wrapper"
 
 describe("lsp utils", () => {
   describe("findWorkspaceRoot", () => {