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/grep/tools.ts

@@ -1,7 +1,7 @@
 import type { PluginInput } from "@opencode-ai/plugin"
 import { tool, type ToolDefinition } from "@opencode-ai/plugin/tool"
 import { runRg } from "./cli"
-import { formatGrepResult } from "./utils"
+import { formatGrepResult } from "./result-formatter"
 
 export function createGrepTools(ctx: PluginInput): Record<string, ToolDefinition> {
   const grep: ToolDefinition = tool({