docs: Add draft blog for 0.15

Author: ntucker

website/blog/.cursor/rules/blog-posts.mdc

@@ -0,0 +1,67 @@
+---
+alwaysApply: true
+---
+
+## Structure
+
+1. **Summary section** (before `<!--truncate-->`)
+   - Lead with most impactful changes
+   - Group related items into logical sections
+   - List breaking changes with links to migration sections
+   - Use bullet lists for quick scanning
+
+2. **`<!--truncate-->`** - Marks preview cutoff
+
+3. **Detailed sections** (after truncate)
+   - Expand on summary items with examples
+   - Group related changes under shared headers
+   - End with Migration Guide for breaking changes
+   - Close with "Upgrade support" linking to Discord/GitHub issues
+
+## Imports
+
+Place after frontmatter, before content:
+
+```tsx
+import Link from '@docusaurus/Link';
+import DiffEditor from '@site/src/components/DiffEditor';
+import TypeScriptEditor from '@site/src/components/TypeScriptEditor';
+import PkgTabs from '@site/src/components/PkgTabs';
+import StackBlitz from '@site/src/components/StackBlitz';
+```
+
+## Code Examples
+
+**Before/After changes:** Use `<DiffEditor>` with two code blocks titled "Before" and "After"
+
+**Interactive TypeScript:** Use `<TypeScriptEditor>` for live examples
+
+**Package installation:** Use `<PkgTabs pkgs="@data-client/react@^0.X.0" upgrade />`
+
+**Embedded demos:** Use `<StackBlitz app="app-name" file="path/to/file.tsx" />`
+
+## Conventions
+
+- **Each change must include:** a link to the PR (or commit if no PR) and relevant doc links
+- Link PRs: `[#1234](https://github.com/reactive/data-client/pull/1234)`
+- Link commits: `` [`abc123`](https://github.com/reactive/data-client/commit/abc123) ``
+- Link docs: `[Controller](/docs/api/Controller)` or `[Entity](/rest/api/Entity)`
+- Use `:::note` / `:::tip` / `:::warning` for callouts
+- Use `// highlight-next-line` in code blocks for emphasis
+
+## Migration Guide Section
+
+- Start with package upgrade command via `<PkgTabs>`
+- Each breaking change gets its own `### Heading {#anchor}`
+- Show before/after with `<DiffEditor>`
+- End with upgrade support blurb:
+
+```md
+### Upgrade support
+
+As usual, if you have any troubles or questions, feel free to join our [![Chat](https://img.shields.io/discord/768254430381735967.svg?style=flat-square&colorB=758ED3)](https://discord.gg/wXGV27xm6t) or [file a bug](https://github.com/reactive/data-client/issues/new/choose)
+```
+
+## Naming Convention
+
+Files: `YYYY-MM-DD-vX.Y-short-description.md`