feat: Implement multi-pass semantic analysis framework with AST transformation pipeline

[Copilot]

Replaces direct expression building pattern with a composable analysis framework supporting multi-pass semantic enrichment, optimization, and code generation.

Architecture Changes

Analysis Framework

• Multi-pass pipeline: type resolution → member resolution → variable lifetime → control flow → constant folding
• AnalysisContext carries metadata across passes using NodeMetadataStore with reference-equality node identity
• Analyzer + AnalyzerBuilder for composing analysis passes
• Diagnostic reporting infrastructure for analysis errors and warnings

AST Nodes

• Immutable record-based node hierarchy replaces mutable Value classes
• Stable NodeId (GUID v7) for node identification across transformations
• Nodes are pure data structures—semantic information lives in analysis context, not nodes

Code Generation

• LinqExpressionGenerator compiles analyzed AST to LINQ expression trees
• Control flow constructs: If, Switch, While, DoWhile, For, Break, Continue, Return, TryCatchFinally, Using
• Mermaid AST visualization with metadata annotations

Domain Modeling

• Renamed DataModeling → DomainModeling to reflect broader scope
• DataModelAstExtensions bridges domain models to AST evaluation
• DataModelMemberAccessAnalyzer resolves property access through introspection bridge

Example

// Build analyzer with semantic passes
var analyzer = new AnalyzerBuilder()
    .WithTypeResolution()
    .WithMemberResolution()
    .WithConstantFolding()
    .Build();

// Analyze AST
var result = analyzer.Analyze(astNode, context);

// Generate LINQ expression from analyzed AST
var generator = new LinqExpressionGenerator(context);
var expression = generator.Generate(result.Node);

Breaking Changes

• Value.BuildExpression() removed—use analysis framework + LinqExpressionGenerator
• InterpretationContext.ToParameterExpression() marked obsolete
• Test helpers updated to use CompileLambda pattern

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