Update README to reflect changes in test infrastructure organization and task decomposition workflow. Remove obsolete E2E test templates and clarify input specifications for integration tests. Enhance documentation for planning and implementation phases, including new directory structures and task management processes.

.cursor/rules/rust.mdc

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+---
+description: "Rust coding conventions: error handling with Result/thiserror/anyhow, ownership patterns, clippy, module structure"
+globs: ["**/*.rs", "**/Cargo.toml", "**/Cargo.lock"]
+---
+# Rust
+
+- Use `Result<T, E>` for recoverable errors; `panic!` only for unrecoverable
+- Use `?` operator for error propagation; define custom error types with `thiserror`; use `anyhow` for application-level errors
+- Prefer references over cloning; minimize unnecessary allocations
+- Never use `unwrap()` in production code; use `expect()` with descriptive message or proper error handling
+- Minimize `unsafe`; document invariants when used; isolate in separate modules
+- Use `Arc<Mutex<T>>` for shared mutable state; prefer channels (`mpsc`) for message passing
+- Use `clippy` and `rustfmt`; treat clippy warnings as errors in CI
+- Module structure: `src/main.rs` or `src/lib.rs` as entry; submodules in separate files
+- Use `#[cfg(test)]` module for unit tests; `tests/` directory for integration tests
+- Use feature flags for conditional compilation
+- Use `serde` for serialization with `derive` feature