chore: initial cargo skeleton

cargo new output as the baseline for the xy MCP supervisor project.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

.gitignore

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+/target

Cargo.toml

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+[package]
+name = "xy"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}