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/shared/index.ts

@@ -16,6 +16,11 @@ export * from "./claude-config-dir"
 export * from "./jsonc-parser"
 export * from "./migration"
 export * from "./opencode-config-dir"
+export type {
+  OpenCodeBinaryType,
+  OpenCodeConfigDirOptions,
+  OpenCodeConfigPaths,
+} from "./opencode-config-dir-types"
 export * from "./opencode-version"
 export * from "./permission-compat"
 export * from "./external-plugin-detector"
@@ -28,12 +33,12 @@ export * from "./system-directive"
 export * from "./agent-tool-restrictions"
 export * from "./model-requirements"
 export * from "./model-resolver"
-export {
-  resolveModelPipeline,
-  type ModelResolutionRequest,
-  type ModelResolutionResult as ModelResolutionPipelineResult,
-  type ModelResolutionProvenance,
-} from "./model-resolution-pipeline"
+export { resolveModelPipeline } from "./model-resolution-pipeline"
+export type {
+  ModelResolutionRequest,
+  ModelResolutionProvenance,
+  ModelResolutionResult as ModelResolutionPipelineResult,
+} from "./model-resolution-types"
 export * from "./model-availability"
 export * from "./connected-providers-cache"
 export * from "./session-utils"

src/shared/model-resolution-pipeline.ts

@@ -1,36 +1,16 @@
 import { log } from "./logger"
 import { readConnectedProvidersCache } from "./connected-providers-cache"
 import { fuzzyMatchModel } from "./model-availability"
-import type { FallbackEntry } from "./model-requirements"
+import type {
+  ModelResolutionRequest,
+  ModelResolutionResult,
+} from "./model-resolution-types"
 
-export type ModelResolutionRequest = {
-  intent?: {
-    uiSelectedModel?: string
-    userModel?: string
-    categoryDefaultModel?: string
-  }
-  constraints: {
-    availableModels: Set<string>
-  }
-  policy?: {
-    fallbackChain?: FallbackEntry[]
-    systemDefaultModel?: string
-  }
-}
-
-export type ModelResolutionProvenance =
-  | "override"
-  | "category-default"
-  | "provider-fallback"
-  | "system-default"
-
-export type ModelResolutionResult = {
-  model: string
-  provenance: ModelResolutionProvenance
-  variant?: string
-  attempted?: string[]
-  reason?: string
-}
+export type {
+  ModelResolutionProvenance,
+  ModelResolutionRequest,
+  ModelResolutionResult,
+} from "./model-resolution-types"
 
 function normalizeModel(model?: string): string | undefined {
   const trimmed = model?.trim()

src/shared/model-resolution-types.ts

@@ -0,0 +1,30 @@
+import type { FallbackEntry } from "./model-requirements"
+
+export type ModelResolutionRequest = {
+  intent?: {
+    uiSelectedModel?: string
+    userModel?: string
+    categoryDefaultModel?: string
+  }
+  constraints: {
+    availableModels: Set<string>
+  }
+  policy?: {
+    fallbackChain?: FallbackEntry[]
+    systemDefaultModel?: string
+  }
+}
+
+export type ModelResolutionProvenance =
+  | "override"
+  | "category-default"
+  | "provider-fallback"
+  | "system-default"
+
+export type ModelResolutionResult = {
+  model: string
+  provenance: ModelResolutionProvenance
+  variant?: string
+  attempted?: string[]
+  reason?: string
+}

src/shared/opencode-config-dir-types.ts

@@ -0,0 +1,15 @@
+export type OpenCodeBinaryType = "opencode" | "opencode-desktop"
+
+export type OpenCodeConfigDirOptions = {
+  binary: OpenCodeBinaryType
+  version?: string | null
+  checkExisting?: boolean
+}
+
+export type OpenCodeConfigPaths = {
+  configDir: string
+  configJson: string
+  configJsonc: string
+  packageJson: string
+  omoConfig: string
+}

src/shared/opencode-config-dir.ts

@@ -2,21 +2,17 @@ import { existsSync } from "node:fs"
 import { homedir } from "node:os"
 import { join, resolve } from "node:path"
 
-export type OpenCodeBinaryType = "opencode" | "opencode-desktop"
+import type {
+  OpenCodeBinaryType,
+  OpenCodeConfigDirOptions,
+  OpenCodeConfigPaths,
+} from "./opencode-config-dir-types"
 
-export interface OpenCodeConfigDirOptions {
-  binary: OpenCodeBinaryType
-  version?: string | null
-  checkExisting?: boolean
-}
-
-export interface OpenCodeConfigPaths {
-  configDir: string
-  configJson: string
-  configJsonc: string
-  packageJson: string
-  omoConfig: string
-}
+export type {
+  OpenCodeBinaryType,
+  OpenCodeConfigDirOptions,
+  OpenCodeConfigPaths,
+} from "./opencode-config-dir-types"
 
 export const TAURI_APP_IDENTIFIER = "ai.opencode.desktop"
 export const TAURI_APP_IDENTIFIER_DEV = "ai.opencode.desktop.dev"

src/shared/tmux/tmux-utils.ts

@@ -1,7 +1,7 @@
 import { spawn } from "bun"
 import type { TmuxConfig, TmuxLayout } from "../../config/schema"
 import type { SpawnPaneResult } from "./types"
-import { getTmuxPath } from "../../tools/interactive-bash/utils"
+import { getTmuxPath } from "../../tools/interactive-bash/tmux-path-resolver"
 
 let serverAvailable: boolean | null = null
 let serverCheckUrl: string | null = null