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/typography-text-align.md

@@ -0,0 +1,60 @@
+---
+name: typography-text-align
+description: Controlling text alignment with left, center, right, justify, and logical properties
+---
+
+# Text Align
+
+Utilities for controlling the alignment of text.
+
+## Usage
+
+### Basic alignment
+
+Use `text-left`, `text-center`, `text-right`, `text-justify`:
+
+```html
+<p class="text-left">Left aligned</p>
+<p class="text-center">Center aligned</p>
+<p class="text-right">Right aligned</p>
+<p class="text-justify">Justified text</p>
+```
+
+### Logical properties
+
+Use `text-start` and `text-end` for RTL-aware alignment:
+
+```html
+<div dir="ltr">
+  <p class="text-start">Left in LTR</p>
+  <p class="text-end">Right in LTR</p>
+</div>
+<div dir="rtl">
+  <p class="text-start">Right in RTL</p>
+  <p class="text-end">Left in RTL</p>
+</div>
+```
+
+### Responsive alignment
+
+```html
+<p class="text-left md:text-center lg:text-right">
+  Responsive alignment
+</p>
+```
+
+## Key Points
+
+- `text-left` - aligns to left edge
+- `text-center` - centers text
+- `text-right` - aligns to right edge
+- `text-justify` - justifies text (spaces words evenly)
+- `text-start` - aligns to start (left in LTR, right in RTL)
+- `text-end` - aligns to end (right in LTR, left in RTL)
+- Use logical properties (`text-start`, `text-end`) for internationalization
+- Common pattern: `text-center` for headings, `text-left` for body text
+
+<!--
+Source references:
+- https://tailwindcss.com/docs/text-align
+-->