[Feature]: Model-level expression evaluation — umbrella (InvocationExpression::evaluate + Function::isModelLevelEvaluable) #322

Description

Umbrella for the two derived members in the Expression / Function family that cannot be implemented
as plain derived-property ports. Both have no OCL derivation; both are backed by the Kernel
Functions Library. Together they are the last 2 of only 4 remaining NotSupportedException stubs
across SysML2.NET/Extend/.

Sub-issues

• [Feature]: Function::isModelLevelEvaluable — generate the Kernel Functions Library membership set #364 — Function::isModelLevelEvaluable. A Kernel Functions Library membership test against
  the 39 operator rows of KerML 1.0 Table 5 (§8.2.5.8.1) and Table 7 (§8.2.5.8.2). Generated, not
  hardcoded: 36 of the 39 rows derive from the KEBNF operator terminals, four XMI operator = '…'
  constraints, and the Kernel Function Library .kpar; only the 3 No rows stay curated. No engine
  required. Also completes the runtime behaviour of
  InvocationExpressionExtensions.ComputeRedefinedModelLevelEvaluableOperation
  (SysML2.NET/Extend/InvocationExpressionExtensions.cs:57).
• [Feature]: InvocationExpression::evaluate — model-level expression evaluation engine #365 — InvocationExpression::evaluate. The model-level expression evaluation engine:
  library-function resolution, dispatch registry, evaluation context, literal factory, the function
  bodies, and the non-library fallback. [Feature]: Function::isModelLevelEvaluable — generate the Kernel Functions Library membership set #364 is a prerequisite — dispatch keys on the same function
  set.

Not in scope

• Reflective metaclass features (KerML 1.0 §9.2.17) — the remaining two Extend stubs,
  SysML2.NET/Extend/MetadataAccessExpressionExtensions.cs:163 and
  SysML2.NET/Extend/MetadataFeatureExtensions.cs:208. They block the meta and @@ operators
  inside [Feature]: InvocationExpression::evaluate — model-level expression evaluation engine #365 but are a separate MOF-registry workstream.
• The valuation clause omitted at SysML2.NET/Extend/ExpressionExtensions.cs:170. This is
  not unblocked by the evaluation engine (as an earlier revision of this issue claimed).
  IFeature has no valuation property because the generator skipped it: in
  Resources/KerML_only_xmi.uml:7469 it is declared as an association ownedEnd, not an
  ownedAttribute. That is an independent code-generation gap and needs its own issue.

System Configuration

• SysML2.NET version: 0.19.0
• Source files:
  • SysML2.NET/Extend/FunctionExtensions.cs
  • SysML2.NET/Extend/InvocationExpressionExtensions.cs