Add misses-rt crate, component example, README, and fix codegen for non-keyword literal tokens

- misses-rt: add Buffer/Markup HTML helpers, name/type helpers, parse_sections/parse_kv, and template AST
- codegen: add is_syn_keyword() — non-keyword idents in patterns now generate parse+compare instead of syn::Token![…]
- parser: split punct vs ident chars in literal pattern tokens so `props:` becomes two tokens
- examples: add component.mrs/.rs demonstrating named literal tokens and tt capture
- README: comprehensive guide covering .mrs syntax, running the compiler, misses-rt helpers, and examples

https://claude.ai/code/session_01Tppkab4eLsL21asHGjQJoF

Cargo.lock

@@ -12,6 +12,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "misses-rt"
+version = "0.1.0"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "prettyplease"
 version = "0.2.37"