Initial implementation: core agent with HTTP API and full toolset

- Rust-based autonomous coding agent
- HTTP API for task submission (POST /api/task) and status (GET /api/task/{id})
- SSE streaming for real-time progress (GET /api/task/{id}/stream)
- OpenRouter integration with configurable models
- Tool system with: file_ops, directory, terminal, search, web, git
- Agent loop following 'tools in a loop' pattern
- System prompt with tool definitions and rules

Cargo.toml

@@ -0,0 +1,41 @@
+[package]
+name = "open_agent"
+version = "0.1.0"
+edition = "2021"
+description = "A minimal autonomous coding agent with full machine access"
+authors = ["Open Agent Contributors"]
+
+[dependencies]
+# Async runtime
+tokio = { version = "1", features = ["full"] }
+tokio-stream = "0.1"
+
+# Web framework
+axum = { version = "0.7", features = ["ws"] }
+tower-http = { version = "0.5", features = ["cors", "trace"] }
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+
+# HTTP client
+reqwest = { version = "0.12", features = ["json", "stream"] }
+
+# Logging
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+
+# Utilities
+uuid = { version = "1", features = ["v4", "serde"] }
+thiserror = "1"
+async-trait = "0.1"
+futures = "0.3"
+
+# For tool implementations
+walkdir = "2"
+urlencoding = "2"
+anyhow = "1"
+async-stream = "0.3"
+
+[dev-dependencies]
+tokio-test = "0.4"