updated plan

Documentation/Mile_Stones/Milestone_1.md

@@ -3,6 +3,7 @@
 
 ### 1. Workspace Setup
 - [ ] Initialize the root Cargo workspace: `cargo init --vcs none` (delete `src/`). Create a root `Cargo.toml` with `[workspace] members = ["core_protocol", "server_node", "client_node"]`.
+- [ ] **AI Context Trap (File Structure):** Strictly adhere to the directory layout and module hierarchy defined in `File_Structure.md`. Do not invent new file paths or module names; map every new crate and file exactly to the blueprint.
 - [ ] Create crates: `cargo new --lib core_protocol`, `cargo new --bin server_node`, `cargo new --bin client_node`.
 - [ ] Add strict lints (`#![forbid(unsafe_code)]`, etc.) to the root workspace or individual `lib.rs`/`main.rs` files.
 - [ ] **Dependencies (`core_protocol`):** Add `serde`, `bincode`, `uuid`, `chrono`, `thiserror`, `secrecy` (for zeroing sensitive keys).
@@ -18,7 +19,7 @@
 - [ ] **Server:** In `server_node/src/main.rs`, initialize `tokio::net::TcpListener::bind("0.0.0.0:8080")`.
 - [ ] **Server:** Spawn a new `tokio::spawn(async move { ... })` for each incoming `TcpStream`.
 - [ ] **Client:** In `client_node/src/network/control.rs`, implement `TcpStream::connect("127.0.0.1:8080")`.
-- [ ] **Shared:** Implement a framing mechanism (e.g., sending a `u32` length prefix before the `bincode` serialized `TcpEvent`) to prevent TCP stream fragmentation.
+- [ ] **AI Context Trap (TCP Framing):** Raw TCP streams suffer from fragmentation. Do NOT attempt to manually buffer bytes. You must use `tokio_util::codec::LengthDelimitedCodec` (with `tokio_serde` and `bincode`) to abstract the frame boundaries cleanly.
 
 ### 4. Login Logic & State
 - [ ] **Server State:** Create `server_node/src/state.rs`. Define a `DashMap<u32, UserState>` to store active session tokens.