chore: update .gitignore and add R2 upload script for artifact management

- Added .automaker/images/ to .gitignore to prevent tracking of generated images.
- Deleted obsolete agent-output.md and feature.json files related to removed "Agent Tools" feature.
- Introduced a new script for uploading build artifacts to R2 and updating releases.json.
- Enhanced GitHub Actions workflow to include artifact uploads for different platforms.

.automaker/features/feature-1765525566442-wsdrtodkc/agent-output.md

@@ -1,33 +0,0 @@
-The navigation now shows only:
-- **Project** section: Kanban Board, Agent Runner
-- **Tools** section: Spec Editor, Context, AI Profiles
-
-The "Agent Tools" item has been successfully removed from the side navigation.
-
-## Summary
-
-I've successfully removed "Agent Tools" from the side navigation by making the following changes:
-
-### Files Modified:
-
-1. **`apps/app/src/components/layout/sidebar.tsx`**
-   - Removed the navigation item for "Agent Tools" (id: "tools")
-   - Removed the unused `Wrench` icon import from lucide-react
-
-2. **`apps/app/src/components/ui/keyboard-map.tsx`**
-   - Removed `tools: "Agent Tools"` from `SHORTCUT_LABELS`
-   - Removed `tools: "navigation"` from `SHORTCUT_CATEGORIES`
-
-3. **`apps/app/src/store/app-store.ts`**
-   - Removed `"tools"` from the `ViewMode` type union
-   - Removed `tools: string` from the `KeyboardShortcuts` interface
-   - Removed `tools: "T"` from `DEFAULT_KEYBOARD_SHORTCUTS`
-
-4. **`apps/app/src/app/page.tsx`**
-   - Removed the import for `AgentToolsView`
-   - Removed the `case "tools": return <AgentToolsView />` from the view switch statement
-
-### Notes:
-- The `agent-tools-view.tsx` component file was **not** deleted, as the user only requested to remove it from the navigation. The component remains in the codebase in case it's needed later.
-- The keyboard shortcut "T" is now available for other features if needed.
-- All lint errors found are pre-existing in the codebase and not related to these changes.

.automaker/features/feature-1765525566442-wsdrtodkc/feature.json

@@ -1,14 +0,0 @@
-{
-  "category": "Uncategorized",
-  "description": "for now, just remove agent tools from the side navigation, they are useless",
-  "steps": [],
-  "status": "completed",
-  "images": [],
-  "imagePaths": [],
-  "skipTests": true,
-  "model": "opus",
-  "thinkingLevel": "none",
-  "id": "feature-1765525566442-wsdrtodkc",
-  "startedAt": "2025-12-12T07:46:08.507Z",
-  "updatedAt": "2025-12-12T07:48:34.967Z"
-}