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/delegate-task-retry/hook.ts

@@ -0,0 +1,21 @@
+import type { PluginInput } from "@opencode-ai/plugin"
+
+import { buildRetryGuidance } from "./guidance"
+import { detectDelegateTaskError } from "./patterns"
+
+export function createDelegateTaskRetryHook(_ctx: PluginInput) {
+  return {
+    "tool.execute.after": async (
+      input: { tool: string; sessionID: string; callID: string },
+      output: { title: string; output: string; metadata: unknown }
+    ) => {
+      if (input.tool.toLowerCase() !== "task") return
+
+      const errorInfo = detectDelegateTaskError(output.output)
+      if (errorInfo) {
+        const guidance = buildRetryGuidance(errorInfo)
+        output.output += `\n${guidance}`
+      }
+    },
+  }
+}