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/delegate-task/sync-result-fetcher.ts

@@ -0,0 +1,31 @@
+import type { OpencodeClient } from "./types"
+import type { SessionMessage } from "./executor-types"
+
+export async function fetchSyncResult(
+  client: OpencodeClient,
+  sessionID: string
+): Promise<{ ok: true; textContent: string } | { ok: false; error: string }> {
+  const messagesResult = await client.session.messages({
+    path: { id: sessionID },
+  })
+
+  if ((messagesResult as { error?: unknown }).error) {
+    return { ok: false, error: `Error fetching result: ${(messagesResult as { error: unknown }).error}\n\nSession ID: ${sessionID}` }
+  }
+
+  const messages = ((messagesResult as { data?: unknown }).data ?? messagesResult) as SessionMessage[]
+
+  const assistantMessages = messages
+    .filter((m) => m.info?.role === "assistant")
+    .sort((a, b) => (b.info?.time?.created ?? 0) - (a.info?.time?.created ?? 0))
+  const lastMessage = assistantMessages[0]
+
+  if (!lastMessage) {
+    return { ok: false, error: `No assistant response found.\n\nSession ID: ${sessionID}` }
+  }
+
+  const textParts = lastMessage?.parts?.filter((p) => p.type === "text" || p.type === "reasoning") ?? []
+  const textContent = textParts.map((p) => p.text ?? "").filter(Boolean).join("\n")
+
+  return { ok: true, textContent }
+}