feat: connecting linter

[sehwan505]

• engine 삭제
• adapter 직접 연결
• gpt-4o로 전환

[Copilot]

Pull Request Overview

This PR implements a significant architectural refactoring that removes the engine abstraction layer in favor of direct adapter usage. The changes include deleting the entire internal/engine package (pattern, length, style, ast, typechecker, llm engines), simplifying the adapter registry to use tool names directly, and switching the default LLM model from gpt-4o-mini to gpt-4o.

Key Changes:

• Removed engine abstraction layer and connected validators directly to adapters
• Simplified adapter registry from language+category lookup to simple tool name lookup
• Changed default LLM model from gpt-4o-mini to gpt-4o across the codebase
• Removed GenerateConfig method from adapter interface
• Added new cmd/test-adapter CLI tool for testing adapters

Reviewed Changes

Copilot reviewed 62 out of 62 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/integration/*.go	Deleted 5 integration test files for engines (validator_policy_test.go, typechecker_integration_test.go, style_integration_test.go, pattern_integration_test.go, length_integration_test.go, ast_integration_test.go)
tests/integration/helper.go	Removed getToolsDir helper function
tests/e2e/*.go	Updated model from gpt-4o-mini to gpt-4o, fixed formatting (tabs→spaces)
internal/validator/validator.go	Major refactor: removed engine dependency, added direct adapter usage with new Violation fields (RawOutput, RawError, ToolName, ExecutionMs)
internal/mcp/server.go	Updated model to gpt-4o, formatting fix
internal/llm/client.go	Changed defaultModel constant from gpt-4o-mini to gpt-4o
internal/engine/*	Deleted entire engine package (core, registry, pattern, length, style, ast, typechecker, llm)
internal/converter/converter.go	Added special LLM validator handling with default selector and desc validation
internal/cmd/*.go	Updated default model flags from gpt-4o-mini to gpt-4o
internal/adapter/registry/*.go	Simplified registry from language+category to tool name lookup
internal/adapter//.go	Removed GenerateConfig method, cleaned up tests, fixed defer patterns
internal/adapter/adapter.go	Removed GenerateConfig from interface
docs/*.md	Updated documentation to reflect gpt-4o as default
cmd/test-adapter/main.go	New CLI tool for testing adapters directly

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