docs: add AGENTS.md for agentic coding agents

Provides build/dev/test commands, code style guidelines, and architecture
overview for AI coding assistants working in this repository.

Author: jms830

.gitignore

@@ -29,7 +29,6 @@ src-tauri/binaries/
 temp_lib/
 
 .cursor/
-AGENTS.md
 CLAUDE.md
 *_TASK.md
 

AGENTS.md

@@ -0,0 +1,24 @@
+# Agent Guidelines for Opcode
+
+## Build & Dev Commands
+- `bun install` - Install dependencies
+- `bun run dev` - Start Vite dev server (frontend only)
+- `bun run tauri dev` - Full Tauri development mode
+- `bun run build` - Build frontend (`tsc && vite build`)
+- `bun run tauri build` - Production build
+- `bun run check` - TypeScript + Rust check (`tsc --noEmit && cargo check`)
+- `cd src-tauri && cargo test` - Run Rust tests
+- `cd src-tauri && cargo fmt && cargo clippy` - Format and lint Rust
+
+## Code Style
+- **TypeScript**: Strict mode, no unused vars/params, ES2020 target, React JSX
+- **Rust**: Edition 2021, use `cargo fmt` before commits, address `clippy` warnings
+- **Imports**: Use `@/*` path alias for `./src/*` in TypeScript
+- **Naming**: camelCase (TS), snake_case (Rust), PascalCase for types/components
+- **Errors**: Use `Result<T, String>` in Rust commands, try/catch in TS async functions
+
+## Architecture
+- Frontend: React + TypeScript + Vite in `src/`
+- Backend: Tauri + Rust in `src-tauri/src/`
+- Tauri commands in `src-tauri/src/commands/` expose Rust to frontend via `invoke()`
+- Use `#[cfg(windows)]` / `#[cfg(unix)]` for platform-specific code