fix: documentation

[vmarcella]

• Add comprehensive Rustdoc across public APIs in lambda-rs (component, math,
  render, runtime, runtimes)
• Document math::Angle variants and render::ResourceId alias
• Clarify WindowBuilder::with_vsync behavior (present-mode set in renderer;
  currently no-op flag)
• Add module-level docs for runtimes and detailed docs for
  ApplicationRuntimeBuilder and ComponentResult
• Add crate-level docs to lambda-rs-platform and module docs for obj and rand
• Document winit WindowHandle and WindowHandleBuilder structures
• Expand logging docs: document Handler trait and ConsoleHandler behavior
• Major docs pass in lambda-rs-args: ArgumentParser overview, ArgumentType
  variants, ArgumentValue, Argument builder methods, ParsedArgument, ArgsError,
  ParsedArgs getters
• Improve buffer documentation: BufferType/Usage/Properties/Buffer/BufferBuilder
  and key methods
• Standardize explicit return style by allowing clippy::needless_return at the
  top of all affected modules (core crates, examples, tests)