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/interactive-bash/index.ts

@@ -1,4 +1,4 @@
 import { interactive_bash } from "./tools"
-import { startBackgroundCheck } from "./utils"
+import { startBackgroundCheck } from "./tmux-path-resolver"
 
 export { interactive_bash, startBackgroundCheck }

src/tools/interactive-bash/tools.ts

@@ -1,6 +1,6 @@
 import { tool, type ToolDefinition } from "@opencode-ai/plugin/tool"
 import { BLOCKED_TMUX_SUBCOMMANDS, DEFAULT_TIMEOUT_MS, INTERACTIVE_BASH_DESCRIPTION } from "./constants"
-import { getCachedTmuxPath } from "./utils"
+import { getCachedTmuxPath } from "./tmux-path-resolver"
 
 /**
  * Quote-aware command tokenizer with escape handling