v0.5.0: NomadArch - Binary-Free Mode Release

Features:
- Binary-Free Mode: No OpenCode binary required
- NomadArch Native mode with free Zen models
- Native session management
- Provider routing (Zen, Qwen, Z.AI)
- Fixed MCP connection with explicit connectAll()
- Updated installers and launchers for all platforms
- UI binary selector with Native option

Free Models Available:
- GPT-5 Nano (400K context)
- Grok Code Fast 1 (256K context)
- GLM-4.7 (205K context)
- Doubao Seed Code (256K context)
- Big Pickle (200K context)

tasks/done/021-file-attachments.md

@@ -0,0 +1,40 @@
+---
+title: File Attachments
+description: Add @mentions, drag & drop, and chips for files.
+---
+
+Implement File Attachments
+
+---
+
+### Implement @ Mentions
+
+When a user types `@` in the input field, display a file picker with search functionality.
+
+Allow users to select files to attach to their prompt.
+
+---
+
+### Visual Attachment Chips
+
+Display attached files as interactive chips above the input area.
+
+Chips should include a filename and a removable "x" button.
+
+---
+
+### Drag and Drop Files
+
+Enable dragging files from the operating system directly onto the input area.
+
+Automatically create an attachment chip for dropped files.
+
+---
+
+### Acceptance Criteria
+
+- Typing `@` brings up a file selection autocomplete.
+- Files can be selected and appear as chips.
+- Users can drag and drop files onto the input, creating chips.
+- Attached files are included in the prompt submission.
+- Attachment chips can be removed by clicking "x".