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/hooks/comment-checker/pending-calls.ts

@@ -0,0 +1,32 @@
+import type { PendingCall } from "./types"
+
+const pendingCalls = new Map<string, PendingCall>()
+const PENDING_CALL_TTL = 60_000
+
+let cleanupIntervalStarted = false
+
+function cleanupOldPendingCalls(): void {
+  const now = Date.now()
+  for (const [callID, call] of pendingCalls) {
+    if (now - call.timestamp > PENDING_CALL_TTL) {
+      pendingCalls.delete(callID)
+    }
+  }
+}
+
+export function startPendingCallCleanup(): void {
+  if (cleanupIntervalStarted) return
+  cleanupIntervalStarted = true
+  setInterval(cleanupOldPendingCalls, 10_000)
+}
+
+export function registerPendingCall(callID: string, pendingCall: PendingCall): void {
+  pendingCalls.set(callID, pendingCall)
+}
+
+export function takePendingCall(callID: string): PendingCall | undefined {
+  const pendingCall = pendingCalls.get(callID)
+  if (!pendingCall) return undefined
+  pendingCalls.delete(callID)
+  return pendingCall
+}