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CODE_REVIEW_FRE-327.md

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+# Code Review: FRE-327 - Checkpoint & Resume
+
+## Verdict: APPROVED with suggestions
+
+Reviewed all 4 files in `src/checkpoint/`:
+- `__init__.py` (13 lines)
+- `checkpoint_schema.py` (218 lines)
+- `state_manager.py` (326 lines)
+- `resume_handler.py` (303 lines)
+
+## Strengths
+✅ Well-designed checkpoint schema with proper versioning
+✅ Atomic file writes to prevent corruption
+✅ Book hash validation to detect input changes
+✅ Good progress tracking per stage
+✅ Graceful interrupt handling with checkpoint saving
+✅ Clear separation between StateManager and ResumeHandler
+
+## Suggestions (non-blocking)
+
+### 1. resume_handler.py:121-122 - Dead code
+```python
+if self._checkpoint is None and self.should_resume():
+    pass
+```
+This does nothing and should be removed.
+
+### 2. resume_handler.py:207-208 - Dead code
+```python
+if self._checkpoint is None and self.should_resume():
+    pass
+```
+Another dead code block that should be removed.
+
+### 3. checkpoint_schema.py:154 - Potential KeyError
+```python
+return CheckpointStage[self.current_stage.upper()]
+```
+Could raise KeyError if `current_stage` is set to an invalid value. Consider using `.get()` instead.
+
+### 4. state_manager.py:155-156, 188, 210 - Import inside function
+```python
+from src.checkpoint.checkpoint_schema import StageProgress
+```
+These imports should be at module level for efficiency.
+
+### 5. state_manager.py:319-324 - Directory hash performance
+`compute_directory_hash` reads all files which could be slow for large directories. Consider caching or using mtime-based approach.
+
+## Overall Assessment
+Solid checkpoint and resume implementation. The issues identified are minor and do not block functionality.