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/category-skill-reminder/formatter.ts

@@ -0,0 +1,37 @@
+import type { AvailableSkill } from "../../agents/dynamic-agent-prompt-builder"
+
+function formatSkillNames(skills: AvailableSkill[], limit: number): string {
+  if (skills.length === 0) return "(none)"
+  const shown = skills.slice(0, limit).map((s) => s.name)
+  const remaining = skills.length - shown.length
+  const suffix = remaining > 0 ? ` (+${remaining} more)` : ""
+  return shown.join(", ") + suffix
+}
+
+export function buildReminderMessage(availableSkills: AvailableSkill[]): string {
+  const builtinSkills = availableSkills.filter((s) => s.location === "plugin")
+  const customSkills = availableSkills.filter((s) => s.location !== "plugin")
+
+  const builtinText = formatSkillNames(builtinSkills, 8)
+  const customText = formatSkillNames(customSkills, 8)
+
+  const exampleSkillName = customSkills[0]?.name ?? builtinSkills[0]?.name
+  const loadSkills = exampleSkillName ? `["${exampleSkillName}"]` : "[]"
+
+  const lines = [
+    "",
+    "[Category+Skill Reminder]",
+    "",
+    `**Built-in**: ${builtinText}`,
+    `**⚡ YOUR SKILLS (PRIORITY)**: ${customText}`,
+    "",
+    "> User-installed skills OVERRIDE built-in defaults. ALWAYS prefer YOUR SKILLS when domain matches.",
+    "",
+    "```typescript",
+    `task(category=\"visual-engineering\", load_skills=${loadSkills}, run_in_background=true)`,
+    "```",
+    "",
+  ]
+
+  return lines.join("\n")
+}