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/agents/agent-builder.ts

@@ -0,0 +1,52 @@
+import type { AgentConfig } from "@opencode-ai/sdk"
+import type { AgentFactory } from "./types"
+import type { CategoriesConfig, CategoryConfig, GitMasterConfig } from "../config/schema"
+import type { BrowserAutomationProvider } from "../config/schema"
+import { DEFAULT_CATEGORIES } from "../tools/delegate-task/constants"
+import { resolveMultipleSkills } from "../features/opencode-skill-loader/skill-content"
+
+export type AgentSource = AgentFactory | AgentConfig
+
+export function isFactory(source: AgentSource): source is AgentFactory {
+  return typeof source === "function"
+}
+
+export function buildAgent(
+  source: AgentSource,
+  model: string,
+  categories?: CategoriesConfig,
+  gitMasterConfig?: GitMasterConfig,
+  browserProvider?: BrowserAutomationProvider,
+  disabledSkills?: Set<string>
+): AgentConfig {
+  const base = isFactory(source) ? source(model) : source
+  const categoryConfigs: Record<string, CategoryConfig> = categories
+    ? { ...DEFAULT_CATEGORIES, ...categories }
+    : DEFAULT_CATEGORIES
+
+  const agentWithCategory = base as AgentConfig & { category?: string; skills?: string[]; variant?: string }
+  if (agentWithCategory.category) {
+    const categoryConfig = categoryConfigs[agentWithCategory.category]
+    if (categoryConfig) {
+      if (!base.model) {
+        base.model = categoryConfig.model
+      }
+      if (base.temperature === undefined && categoryConfig.temperature !== undefined) {
+        base.temperature = categoryConfig.temperature
+      }
+      if (base.variant === undefined && categoryConfig.variant !== undefined) {
+        base.variant = categoryConfig.variant
+      }
+    }
+  }
+
+  if (agentWithCategory.skills?.length) {
+    const { resolved } = resolveMultipleSkills(agentWithCategory.skills, { gitMasterConfig, browserProvider, disabledSkills })
+    if (resolved.size > 0) {
+      const skillContent = Array.from(resolved.values()).join("\n\n")
+      base.prompt = skillContent + (base.prompt ? "\n\n" + base.prompt : "")
+    }
+  }
+
+  return base
+}