feat: refine gsap-framer-scroll-animation skill and references

docs/README.skills.md

@@ -152,6 +152,7 @@ See [CONTRIBUTING.md](../CONTRIBUTING.md#adding-skills) for guidelines on how to
 | [github-copilot-starter](../skills/github-copilot-starter/SKILL.md) | Set up complete GitHub Copilot configuration for a new project based on technology stack | None |
 | [github-issues](../skills/github-issues/SKILL.md) | Create, update, and manage GitHub issues using MCP tools. Use this skill when users want to create bug reports, feature requests, or task issues, update existing issues, add labels/assignees/milestones, set issue fields (dates, priority, custom fields), set issue types, manage issue workflows, link issues, add dependencies, or track blocked-by/blocking relationships. Triggers on requests like "create an issue", "file a bug", "request a feature", "update issue X", "set the priority", "set the start date", "link issues", "add dependency", "blocked by", "blocking", or any GitHub issue management task. | `references/dependencies.md`<br />`references/images.md`<br />`references/issue-fields.md`<br />`references/issue-types.md`<br />`references/projects.md`<br />`references/search.md`<br />`references/sub-issues.md`<br />`references/templates.md` |
 | [go-mcp-server-generator](../skills/go-mcp-server-generator/SKILL.md) | Generate a complete Go MCP server project with proper structure, dependencies, and implementation using the official github.com/modelcontextprotocol/go-sdk. | None |
+| [gsap-framer-scroll-animation](../skills/gsap-framer-scroll-animation/SKILL.md) | Use this skill whenever the user wants to build scroll animations, scroll effects, parallax, scroll-triggered reveals, pinned sections, horizontal scroll, text animations, or any motion tied to scroll position — in vanilla JS, React, or Next.js. Covers GSAP ScrollTrigger (pinning, scrubbing, snapping, timelines, horizontal scroll, ScrollSmoother, matchMedia) and Framer Motion / Motion v12 (useScroll, useTransform, useSpring, whileInView, variants). Use this skill even if the user just says "animate on scroll", "fade in as I scroll", "make it scroll like Apple", "parallax effect", "sticky section", "scroll progress bar", or "entrance animation". Also triggers for Copilot prompt patterns for GSAP or Framer Motion code generation. Pairs with the premium-frontend-ui skill for creative philosophy and design-level polish. | `references/framer.md`<br />`references/gsap.md` |
 | [gtm-0-to-1-launch](../skills/gtm-0-to-1-launch/SKILL.md) | Launch new products from idea to first customers. Use when launching products, finding early adopters, building launch week playbooks, diagnosing why adoption stalls, or learning that press coverage does not equal growth. Includes the three-layer diagnosis, the 2-week experiment cycle, and the launch that got 50K impressions and 12 signups. | None |
 | [gtm-ai-gtm](../skills/gtm-ai-gtm/SKILL.md) | Go-to-market strategy for AI products. Use when positioning AI products, handling "who is responsible when it breaks" objections, pricing variable-cost AI, choosing between copilot/agent/teammate framing, or selling autonomous tools into enterprises. | None |
 | [gtm-board-and-investor-communication](../skills/gtm-board-and-investor-communication/SKILL.md) | Board meeting preparation, investor updates, and executive communication. Use when preparing board decks, writing investor updates, handling bad news with the board, structuring QBRs, or building board-level metric discipline. Includes the "Three Things" narrative model, the 4-tier metric hierarchy, and the pre-brief pattern that prevents board surprises. | None |

skills/gsap-framer-scroll-animation/SKILL.md

@@ -0,0 +1,147 @@
+---
+name: gsap-framer-scroll-animation
+description: >-
+  Use this skill whenever the user wants to build scroll animations, scroll effects,
+  parallax, scroll-triggered reveals, pinned sections, horizontal scroll, text animations,
+  or any motion tied to scroll position — in vanilla JS, React, or Next.js.
+  Covers GSAP ScrollTrigger (pinning, scrubbing, snapping, timelines, horizontal scroll,
+  ScrollSmoother, matchMedia) and Framer Motion / Motion v12 (useScroll, useTransform,
+  useSpring, whileInView, variants). Use this skill even if the user just says
+  "animate on scroll", "fade in as I scroll", "make it scroll like Apple",
+  "parallax effect", "sticky section", "scroll progress bar", or "entrance animation".
+  Also triggers for Copilot prompt patterns for GSAP or Framer Motion code generation.
+  Pairs with the premium-frontend-ui skill for creative philosophy and design-level polish.
+---
+
+# GSAP & Framer Motion — Scroll Animations Skill
+
+Production-grade scroll animations with GitHub Copilot prompts, ready-to-use code recipes, and deep API references.
+
+> **Design Companion:** This skill provides the *technical implementation* for scroll-driven motion.
+> For the *creative philosophy*, design principles, and premium aesthetics that should guide **how**
+> and **when** to animate, always cross-reference the **premium-frontend-ui** skill.
+> Together they form a complete approach: premium-frontend-ui decides the **what** and **why**;
+> this skill delivers the **how**.
+
+## Quick Library Selector
+
+| Need | Use |
+|---|---|
+| Vanilla JS, Webflow, Vue | **GSAP** |
+| Pinning, horizontal scroll, complex timelines | **GSAP** |
+| React / Next.js, declarative style | **Framer Motion** |
+| whileInView entrance animations | **Framer Motion** |
+| Both in same Next.js app | See notes in references |
+
+Read the relevant reference file for full recipes and Copilot prompts:
+
+- **GSAP** → `references/gsap.md` — ScrollTrigger API, all recipes, React integration
+- **Framer Motion** → `references/framer.md` — useScroll, useTransform, all recipes
+
+## Setup (Always Do First)
+
+### GSAP
+```bash
+npm install gsap
+```
+```js
+import gsap from 'gsap';
+import { ScrollTrigger } from 'gsap/ScrollTrigger';
+gsap.registerPlugin(ScrollTrigger); // MUST call before any ScrollTrigger usage
+```
+
+### Framer Motion (Motion v12, 2025)
+```bash
+npm install motion   # new package name since mid-2025
+# or: npm install framer-motion  — still works, same API
+```
+```js
+import { motion, useScroll, useTransform, useSpring } from 'motion/react';
+// legacy: import { motion } from 'framer-motion'  — also valid
+```
+
+## Workflow
+
+1. Interpret the user's intent to identify if GSAP or Framer Motion is the best fit.
+2. Read the relevant reference document in `references/` for detailed APIs and patterns.
+3. Suggest the required package installation if not already present.
+4. Implement the scaffold for the animation structure, adhering to the requested format (React components, hook requirements, or vanilla JS).
+5. Apply the correct tools (scrolling vs in-view elements) ensuring accessibility options are present and hooks don't cause infinite re-renders.
+
+## The 5 Most Common Scroll Patterns
+
+Quick reference — full recipes with Copilot prompts are in the reference files.
+
+### 1. Fade-in on enter (GSAP)
+```js
+gsap.from('.card', {
+  opacity: 0, y: 50, stagger: 0.15, duration: 0.8,
+  scrollTrigger: { trigger: '.card', start: 'top 85%' }
+});
+```
+
+### 2. Fade-in on enter (Framer Motion)
+```jsx
+<motion.div
+  initial={{ opacity: 0, y: 40 }}
+  whileInView={{ opacity: 1, y: 0 }}
+  viewport={{ once: true, margin: '-80px' }}
+  transition={{ duration: 0.6 }}
+/>
+```
+
+### 3. Scrub / scroll-linked (GSAP)
+```js
+gsap.to('.hero-img', {
+  scale: 1.3, opacity: 0, ease: 'none',
+  scrollTrigger: { trigger: '.hero', start: 'top top', end: 'bottom top', scrub: true }
+});
+```
+
+### 4. Scroll-linked (Framer Motion)
+```jsx
+const { scrollYProgress } = useScroll({ target: ref, offset: ['start end', 'end start'] });
+const y = useTransform(scrollYProgress, [0, 1], [0, -100]);
+return <motion.div style={{ y }} />;
+```
+
+### 5. Pinned timeline (GSAP)
+```js
+const tl = gsap.timeline({
+  scrollTrigger: { trigger: '.section', pin: true, scrub: 1, start: 'top top', end: '+=200%' }
+});
+tl.from('.title', { opacity: 0, y: 60 }).from('.img', { scale: 0.85 });
+```
+
+## Critical Rules (Apply Always)
+
+- **GSAP**: always call `gsap.registerPlugin(ScrollTrigger)` before using it
+- **GSAP scrub**: always use `ease: 'none'` — easing feels wrong when scrub is active
+- **GSAP React**: use `useGSAP` from `@gsap/react`, never plain `useEffect` — it auto-cleans ScrollTriggers
+- **GSAP debug**: add `markers: true` during development; remove before production
+- **Framer**: `useTransform` output must go into `style` prop of a `motion.*` element, not a plain div
+- **Framer Next.js**: always add `'use client'` at top of any file using motion hooks
+- **Both**: animate only `transform` and `opacity` — avoid `width`, `height`, `box-shadow`
+- **Accessibility**: always check `prefers-reduced-motion` — see each reference file for patterns
+- **Premium polish**: follow the **premium-frontend-ui** skill principles for motion timing, easing curves, and restraint — animation should enhance, never overwhelm
+
+## Copilot Prompting Tips
+
+- Give Copilot the full selector, base image, and scroll range upfront — vague prompts produce vague code
+- For GSAP, always specify: selector, start/end strings, whether you want scrub or toggleActions
+- For Framer, always specify: which hook (useScroll vs whileInView), offset values, what to transform
+- Paste the exact error message when asking `/fix` — Copilot fixes are dramatically better with real errors
+- Use `@workspace` scope in Copilot Chat so it reads your existing component structure
+
+## Reference Files
+
+| File | Contents |
+|---|---|
+| `references/gsap.md` | Full ScrollTrigger API reference, 10 recipes, React (useGSAP), Lenis, matchMedia, accessibility |
+| `references/framer.md` | Full useScroll / useTransform API, 8 recipes, variants, Motion v12 notes, Next.js tips |
+
+## Related Skills
+
+| Skill | Relationship |
+|---|---|
+| **premium-frontend-ui** | Creative philosophy, design principles, and aesthetic guidelines — defines *when* and *why* to animate |