Implement AnalyzerConfiguration and AnalyzerError

[leogdion]

Phase

Phase 2: Core Configuration & Command Infrastructure

Specification

Create configuration structure using ConfigKeyKit pattern with support for positional arguments and environment variables. Define comprehensive error types.

Acceptance Criteria

• AnalyzerConfiguration implements ConfigurationParseable protocol
• Configuration keys defined: syntaxKitPathKey, apiKeyKey, modelKey, verboseKey
• Positional argument parsing implemented for input folder, syntaxkit path, output folder
• Path validation logic implemented
• AnalyzerError enum defines all error cases
• Code follows one-type-per-file organization

Dependencies

• Depends on: Create ConfigKeyKit Target Structure #109

Files to Create/Modify

• Sources/AiSTKit/AnalyzerConfiguration.swift
• Sources/AiSTKit/AnalyzerError.swift

Related Documentation

• skit-analyze-plan.md