FluNET.Classic 0.1 reflection language foundation

[ppotepa]

What changed

This PR establishes the first FluNET.Classic 0.1 architecture layer while keeping the Classic surface syntax compatible.

• compiles CLR/reflection metadata into language descriptors and immutable LanguageSnapshot
• introduces semantic roles, verb families and result-only IVerb<TResult>
• derives sentence structure from interfaces, constructor parameters, nullability, defaults, params and attributes
• supports overload sets for one language verb (for example scalar vs collection source shapes)
• adds contextual CLR value resolution with explicit resolvers plus enum / TryParse / Parse / TypeConverter / T(string) fallbacks
• introduces immutable AST and semantic binding to BoundSentence / BoundPipeline
• adds constructor activation using bound roles, variables, pipeline values and DI
• adds transitional bound execution including async verb support
• adds module metadata, dependencies, capabilities, execution traits, language validation and JSON/introspection APIs
• adds focused tests for metadata, resolver, binder, activator and introspection
• adds a Classic CI workflow

Why

FluNET.Classic should remain sentence-oriented while allowing the .NET type system itself to describe much of the language. CLR types describe value shape; role interfaces describe semantics; constructors describe binding/cardinality; attributes override conventions; reflection compiles those facts into the language model consumed by parser, binder, tooling and runtime.

Compatibility

The existing GET / SAVE / FROM / TO / USING / WITH / THEN, [variable] and {reference} concepts remain intact. Legacy IVerb<TWhat,TFrom> now projects into the newer result-only verb metadata model instead of being removed.

Validation status

GitHub Actions accepted and queued the new workflow, but GitHub did not allocate a runner (runner_id: 0), so the job failed before checkout and exposed no build steps/logs. The environment available to this task also cannot resolve github.com for a local clone. For that reason this remains a draft checkpoint and should not be merged until a real dotnet build / dotnet test run is available.