Initial commit: Pugz - Pug-like HTML template engine in Zig

Features:
- Lexer with indentation tracking and raw text block support
- Parser producing AST from token stream
- Runtime with variable interpolation, conditionals, loops
- Mixin support (params, defaults, rest args, block content, attributes)
- Template inheritance (extends/block/append/prepend)
- Plain text (piped, dot blocks, literal HTML)
- Tag interpolation (#[tag text])
- Block expansion with colon
- Self-closing tags (void elements + explicit /)
- Case/when statements
- Comments (rendered and silent)

All 113 tests passing.

src/root.zig

@@ -0,0 +1,37 @@
+//! Pugz - A Pug-like HTML template engine written in Zig.
+//!
+//! Pugz provides a clean, indentation-based syntax for writing HTML templates,
+//! inspired by Pug (formerly Jade). It supports:
+//! - Indentation-based nesting
+//! - Tag, class, and ID shorthand syntax
+//! - Attributes and text interpolation
+//! - Control flow (if/else, each, while)
+//! - Mixins and template inheritance
+
+pub const lexer = @import("lexer.zig");
+pub const ast = @import("ast.zig");
+pub const parser = @import("parser.zig");
+pub const codegen = @import("codegen.zig");
+pub const runtime = @import("runtime.zig");
+
+// Re-export main types for convenience
+pub const Lexer = lexer.Lexer;
+pub const Token = lexer.Token;
+pub const TokenType = lexer.TokenType;
+
+pub const Parser = parser.Parser;
+pub const Node = ast.Node;
+pub const Document = ast.Document;
+
+pub const CodeGen = codegen.CodeGen;
+pub const generate = codegen.generate;
+
+pub const Runtime = runtime.Runtime;
+pub const Context = runtime.Context;
+pub const Value = runtime.Value;
+pub const render = runtime.render;
+pub const renderTemplate = runtime.renderTemplate;
+
+test {
+    _ = @import("std").testing.refAllDecls(@This());
+}