Implement Misses DSL compiler (parser + codegen)

- ast.rs: Full AST for .mrs files (MacroDef, Pattern, OutputBody, TemplateItem)
- parser.rs: Hand-written recursive descent parser with line/col error reporting
- codegen.rs: Transforms AST to Rust proc macro code using syn/quote/proc_macro2
- main.rs: CLI reads .mrs file, runs parse→codegen, writes to stdout or file
- Cargo.toml: Workspace with syn, quote, proc-macro2, prettyplease deps
- examples/: hello.mrs, derive_builder.mrs, declare_table.mrs reference examples

All three reference examples parse and produce prettyplease-formatted Rust output.
Generated code uses syn::parse::Parser closures for structural patterns, quote!
for token templates, spread iteration via .iter().map().collect(), and
format_ident! for identifier construction.

https://claude.ai/code/session_01Tppkab4eLsL21asHGjQJoF

misses-compiler/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "misses"
+version = "0.1.0"
+edition = "2021"
+
+[[bin]]
+name = "misses"
+path = "src/main.rs"
+
+[dependencies]
+syn = { version = "2", features = ["full", "extra-traits"] }
+quote = "1"
+proc-macro2 = "1"
+prettyplease = "0.2"