feat: Rust port of Claude Code CLI

Crates:
- api: Anthropic Messages API client with SSE streaming
- tools: Claude-compatible tool implementations (Bash, Read, Write, Edit, Glob, Grep + extended suite)
- runtime: conversation loop, session persistence, permissions, system prompt builder
- rusty-claude-cli: terminal UI with markdown rendering, syntax highlighting, spinners
- commands: subcommand definitions
- compat-harness: upstream TS parity verification

All crates pass cargo fmt/clippy/test.

rust/crates/rusty-claude-cli/Cargo.toml

@@ -0,0 +1,17 @@
+[package]
+name = "rusty-claude-cli"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+publish.workspace = true
+
+[dependencies]
+clap = { version = "4.5.38", features = ["derive"] }
+compat-harness = { path = "../compat-harness" }
+crossterm = "0.29.0"
+pulldown-cmark = "0.13.0"
+runtime = { path = "../runtime" }
+syntect = { version = "5.2.0", default-features = false, features = ["default-fancy"] }
+
+[lints]
+workspace = true