Adv/16 method reader

[peter-lawrey]

“method-dispatch” documentation overhaul

🔍 What changed?

Module	Scope
AbstractGeneratedMethodReader	• Re-document every public + protected member. • Explain the double-buffer message-history design and predicate/scanning flow. • Inline‐docs for SERVICE_NAME, TEMP_MESSAGE_HISTORY_BY_SERVICE_NAME, etc.
GenerateMethodBridge / Delegate	• New class headers that spell out multi-handler fan-out vs hot-swappable delegate use-cases. • Docs for constructor, field emission, and code-gen strategy.
GenerateMethodReader	• 300 + lines of additional explanations: source generation phases, naming algorithm, multipleNonMarshallableParamTypes flag, switch-block generation, interceptor handling.
Runtime helpers (VanillaMethodReader, Builder, MethodDelegate, MethodFilterOnFirstArg)	• Clarify debug toggle, close-semantics, context chaining, sentinel objects. • Describe builder knobs & system properties (disableReaderProxyCodegen, wire.mr.debug).
Utilities (WireDumper, Wires)	• Move @SuppressWarnings below Javadoc to keep IDE tooltips clean.
Small tidy-ups	Typos, line-wraps, import order, @NotNull consistency.

No functional / byte-code changes – only comments and whitespace.