feat: add new OpenSpec skills for change management and onboarding

- Created `openspec-ff-change` skill for fast-forward artifact creation.
- Introduced `openspec-new-change` skill for structured change creation.
- Developed `openspec-onboard` skill for guided onboarding through OpenSpec workflow.
- Added `openspec-sync-specs` skill for syncing delta specs to main specs.
- Implemented `openspec-verify-change` skill for verifying implementation against change artifacts.
- Updated `.gitignore` to exclude OpenSpec generated files.
- Added `skills-lock.json` to manage skill dependencies.

.agents/skills/tailwindcss/references/transform-base.md

@@ -0,0 +1,68 @@
+---
+name: transform-base
+description: Base transform utilities for enabling transforms, hardware acceleration, and custom transform values
+---
+
+# Transform
+
+Base utilities for transforming elements.
+
+## Usage
+
+### Hardware acceleration
+
+Use `transform-gpu` to force GPU acceleration for better performance:
+
+```html
+<div class="scale-150 transform-gpu">
+  GPU-accelerated transform
+</div>
+```
+
+### CPU rendering
+
+Use `transform-cpu` to force CPU rendering if needed:
+
+```html
+<div class="scale-150 transform-cpu">
+  CPU-rendered transform
+</div>
+```
+
+### Removing transforms
+
+Use `transform-none` to remove all transforms:
+
+```html
+<div class="skew-y-3 md:transform-none">
+  Skewed on mobile, normal on desktop
+</div>
+```
+
+### Custom transforms
+
+Use arbitrary values for custom transform functions:
+
+```html
+<div class="transform-[matrix(1,2,3,4,5,6)]">
+  Custom matrix transform
+</div>
+<div class="transform-[perspective(1000px)_rotateX(45deg)]">
+  Custom 3D transform
+</div>
+```
+
+## Key Points
+
+- `transform-gpu` enables hardware acceleration with `translateZ(0)`
+- `transform-cpu` forces CPU rendering (removes GPU acceleration)
+- `transform-none` removes all transforms at once
+- Use `transform-gpu` for better animation performance
+- Custom transforms use arbitrary values: `transform-[...]`
+- Transform utilities (translate, rotate, scale, skew) automatically enable transform
+- Hardware acceleration is usually beneficial for animations
+
+<!--
+Source references:
+- https://tailwindcss.com/docs/transform
+-->