first cut at release notes for v0.12 (#2437)

Author: sawka

docs/docs/releasenotes.mdx

@@ -6,6 +6,34 @@ sidebar_position: 200
 
 # Release Notes
 
+### v0.12.0 — Oct 16, 2025
+
+**Wave v0.12 Has Arrived with Wave AI (beta)!**
+
+Wave Terminal v0.12.0 introduces a completely redesigned AI experience powered by OpenAI GPT-5. This represents a major upgrade and modernization over Wave's previous AI integration, bringing multi-modal support, advanced tool integration, and an intuitive new interface. The main AI PR alone included 128 commits and added 13,000+ lines of code.
+
+**Wave AI Features:**
+- **New Slide-Out Chat Panel** - Access Wave AI via hotkeys (Cmd-Shift-A or Ctrl-Shift-0) from the left side of your screen
+- **Multi-Modal Input** - Support for images, PDFs, and text file attachments
+- **Drag & Drop Files** - Simply drag files into the chat to attach them
+- **Smart Context Switching** - Enable Wave AI to see into your widgets and file system
+- **Built-in Tools:**
+  - Web search capabilities
+  - Local file and directory operations
+  - Widget screenshots
+  - Terminal scrollback access
+  - Web navigation
+
+Wave AI is in active beta with included AI credits while we refine the experience. BYOK (Bring Your Own Key) will be available once we've stabilized core features and gathered feedback on what works best. Share your feedback in our [Discord](https://discord.gg/XfvZ334gwU).
+
+For more information and upcoming features, visit our [Wave AI documentation](https://docs.waveterm.dev/waveai).
+
+**Other Improvements:**
+- New onboarding flow showcasing block magnification, Wave AI, and wsh view/edit capabilities
+- Continued migration from SCSS to Tailwind v4
+- Package upgrades and dependency updates
+- Internal code cleanup and refactoring
+
 ### v0.11.6 — Sep 22, 2025
 
 Patch release to address an editor bug when you open two files in separate edit widgets. Also adds Mermaid support to markdown blocks.