docs: sanitize skills

Author: vinpogo

.github/copilot-instructions.md

@@ -19,44 +19,6 @@ Vue utilities monorepo with independently-versioned packages:
 **When you need to...**
 - **Write tests**: Read [Testing Decisions](./skills/testing-decisions.md) - decision tree for test type, anti-patterns, implementations
 - **Manage state**: Read [State Management](./skills/state-management.md) - singleton patterns, cleanup strategies, scope awareness
-- **Organize files**: Read [Package Structure](./skills/package-structure.md) - exports, dependencies, file creation rules
-- **Build features**: Read [Common Workflows](./skills/common-workflows.md) - step-by-step guides, debugging, code style
-- **Use types safely**: Read [Type Patterns](./skills/type-patterns.md) - type guards, branded types, generics, ambient declarations
 - **Avoid common mistakes**: Read [Common Pitfalls](./skills/common-pitfalls.md) - listener cleanup, export rules, test environments
-- **Debug issues**: Read [Debugging Strategies](./skills/debugging-strategies.md) - Vitest UI, spies, state inspection, linting errors
-- **Improve instructions**: Read [Instruction Validation & Refinement](./skills/instruction-validation.md) - validate patterns, cross-check skills, self-improvement workflow
 
-## Available Scripts
-
-| Command | Purpose |
-|---------|---------|
-| `pnpm test` | Run all tests (unit + browser) |
-| `pnpm build` | Build all packages |
-| `pnpm dev` | Watch mode for all packages |
-| `pnpm lint` | Run oxlint |
-| `pnpm format` | Format with oxfmt |
-| `pnpm changeset` | Create changelog entry after changes |
-
-## Before Committing
-
-- [ ] Tests pass: `pnpm test`
-- [ ] No lint errors: `pnpm lint`
-- [ ] Code formatted: `pnpm format`
-- [ ] Changeset created: `pnpm changeset` or manually in `.changeset/*.md` (if not docs-only)
-- [ ] Demo updated (if user-facing feature)
-
-## Key Files to Follow
-
-**Testing:** [registry.unit.test.ts](../packages/vuebugger/src/registry.unit.test.ts), [directive.browser.test.ts](../packages/vueltip/src/directive.browser.test.ts)
-
-**State:** [registry.ts](../packages/vuebugger/src/registry.ts), [state.ts](../packages/vueltip/src/state.ts)
-
-**Package exports:** [vuebugger/index.ts](../packages/vuebugger/src/index.ts), [vueltip/index.ts](../packages/vueltip/src/index.ts)
-
-## Core Patterns
-
-- **Dev-only code**: Guard with `import.meta.env.DEV` (stripped in prod)
-- **Module singletons**: Maps for tracking, refs for reactive state
-- **Cleanup**: `onScopeDispose()` in composables, directive hooks for listeners
-- **Tree-shaking**: ESM-only, flat package structure, no subdirectories in src/