feat: Implement Study Interview Mode as default study creation method

Study Interview Mode is now the DEFAULT for all study creation requests.
This intelligent Q&A system guides users through optimization setup with:

- 7-phase interview flow: introspection → objectives → constraints → design_variables → validation → review → complete
- Material-aware validation with 12 materials and fuzzy name matching
- Anti-pattern detection for 12 common mistakes (mass-no-constraint, stress-over-yield, etc.)
- Auto extractor mapping E1-E24 based on goal keywords
- State persistence with JSON serialization and backup rotation
- StudyBlueprint generation with full validation

Triggers: "create a study", "new study", "optimize this", any study creation intent
Skip with: "skip interview", "quick setup", "manual config"

Components:
- StudyInterviewEngine: Main orchestrator
- QuestionEngine: Conditional logic evaluation
- EngineeringValidator: MaterialsDatabase + AntiPatternDetector
- InterviewPresenter: Markdown formatting for Claude
- StudyBlueprint: Validated configuration output
- InterviewState: Persistent state management

All 129 tests passing.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

optimization_engine/interview/__init__.py

@@ -0,0 +1,102 @@
+"""
+Atomizer Study Interview Mode
+
+This module provides an intelligent interview system for gathering engineering requirements
+before study generation. It systematically questions users about objectives, constraints,
+and design variables to create accurate optimization configurations.
+
+Components:
+- StudyInterviewEngine: Main orchestrator
+- QuestionEngine: Question flow and conditional logic
+- InterviewStateManager: State persistence
+- InterviewPresenter: Presentation abstraction (ClaudePresenter)
+- EngineeringValidator: Engineering validation and anti-pattern detection
+- InterviewIntelligence: Smart features (extractor mapping, complexity)
+"""
+
+from .interview_state import (
+    InterviewState,
+    InterviewPhase,
+    AnsweredQuestion,
+    InterviewStateManager,
+    LogEntry,
+)
+
+from .question_engine import (
+    QuestionEngine,
+    Question,
+    QuestionOption,
+    QuestionCondition,
+    ValidationRule,
+)
+
+from .interview_presenter import (
+    InterviewPresenter,
+    ClaudePresenter,
+)
+
+from .study_interview import (
+    StudyInterviewEngine,
+    InterviewSession,
+    NextAction,
+)
+
+from .engineering_validator import (
+    EngineeringValidator,
+    MaterialsDatabase,
+    AntiPatternDetector,
+    ValidationResult,
+    AntiPattern,
+)
+
+from .interview_intelligence import (
+    InterviewIntelligence,
+    ExtractorMapper,
+    ExtractorSelection,
+)
+
+from .study_blueprint import (
+    StudyBlueprint,
+    DesignVariable,
+    Objective,
+    Constraint,
+)
+
+__all__ = [
+    # State management
+    "InterviewState",
+    "InterviewPhase",
+    "AnsweredQuestion",
+    "InterviewStateManager",
+    "LogEntry",
+    # Question engine
+    "QuestionEngine",
+    "Question",
+    "QuestionOption",
+    "QuestionCondition",
+    "ValidationRule",
+    # Presentation
+    "InterviewPresenter",
+    "ClaudePresenter",
+    # Main engine
+    "StudyInterviewEngine",
+    "InterviewSession",
+    "NextAction",
+    # Validation
+    "EngineeringValidator",
+    "MaterialsDatabase",
+    "AntiPatternDetector",
+    "ValidationResult",
+    "AntiPattern",
+    # Intelligence
+    "InterviewIntelligence",
+    "ExtractorMapper",
+    "ExtractorSelection",
+    # Blueprint
+    "StudyBlueprint",
+    "DesignVariable",
+    "Objective",
+    "Constraint",
+]
+
+__version__ = "1.0.0"