Vendor opencode source for docker build

opencode/packages/app/AGENTS.md

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+## Debugging
+
+- NEVER try to restart the app, or the server process, EVER.
+
+## Local Dev
+
+- `opencode dev web` proxies `https://app.opencode.ai`, so local UI/CSS changes will not show there.
+- For local UI changes, run the backend and app dev servers separately.
+- Backend (from `packages/opencode`): `bun run --conditions=browser ./src/index.ts serve --port 4096`
+- App (from `packages/app`): `bun dev -- --port 4444`
+- Open `http://localhost:4444` to verify UI changes (it targets the backend at `http://localhost:4096`).
+
+## SolidJS
+
+- Always prefer `createStore` over multiple `createSignal` calls
+
+## Tool Calling
+
+- ALWAYS USE PARALLEL TOOLS WHEN APPLICABLE.
+
+## Browser Automation
+
+Use `agent-browser` for web automation. Run `agent-browser --help` for all commands.
+
+Core workflow:
+
+1. `agent-browser open <url>` - Navigate to page
+2. `agent-browser snapshot -i` - Get interactive elements with refs (@e1, @e2)
+3. `agent-browser click @e1` / `fill @e2 "text"` - Interact using refs
+4. Re-snapshot after page changes