diff --git a/src/calibration/workflow.py b/src/calibration/workflow.py
new file mode 100644
index 0000000..accffd8
--- /dev/null
+++ b/src/calibration/workflow.py
@@ -0,0 +1,170 @@
+"""Complete calibration workflow."""
+import logging
+from typing import List, Dict, Any, Tuple
+from dataclasses import dataclass
+
+from src.email_providers.base import Email
+from src.calibration.sampler import EmailSampler
+from src.calibration.llm_analyzer import CalibrationAnalyzer
+from src.calibration.trainer import ModelTrainer
+from src.classification.feature_extractor import FeatureExtractor
+from src.llm.base import BaseLLMProvider
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class CalibrationConfig:
+    """Calibration workflow configuration."""
+    sample_size: int = 1500
+    validation_size: int = 300
+    llm_batch_size: int = 50
+    model_n_estimators: int = 200
+    model_learning_rate: float = 0.1
+    model_max_depth: int = 8
+
+
+class CalibrationWorkflow:
+    """
+    Complete calibration workflow.
+
+    Steps:
+    1. Sample emails stratified by sender type
+    2. LLM analyzes sample to discover categories
+    3. Trainer trains LightGBM on labeled data
+    4. Validate on held-out test set
+    5. Save trained model
+    """
+
+    def __init__(
+        self,
+        llm_provider: BaseLLMProvider,
+        feature_extractor: FeatureExtractor,
+        categories: Dict[str, Dict],
+        config: CalibrationConfig = None
+    ):
+        """Initialize calibration workflow."""
+        self.llm_provider = llm_provider
+        self.feature_extractor = feature_extractor
+        self.categories = list(categories.keys())
+        self.config = config or CalibrationConfig()
+
+        self.sampler = EmailSampler()
+        self.analyzer = CalibrationAnalyzer(llm_provider, {})
+        self.trainer = ModelTrainer(feature_extractor, self.categories)
+
+        self.results = {}
+
+    def run(
+        self,
+        all_emails: List[Email],
+        model_output_path: str = None
+    ) -> Dict[str, Any]:
+        """
+        Run complete calibration workflow.
+
+        Returns:
+            Workflow results with metrics
+        """
+        logger.info("=" * 80)
+        logger.info("CALIBRATION WORKFLOW")
+        logger.info("=" * 80)
+
+        # Step 1: Sample
+        logger.info("\nStep 1: Sampling emails...")
+        sample_emails, remaining_emails = self.sampler.stratified_sample(
+            all_emails,
+            self.config.sample_size
+        )
+
+        validation_emails = remaining_emails[:self.config.validation_size]
+        logger.info(f"Sample: {len(sample_emails)}, Validation: {len(validation_emails)}")
+
+        # Step 2: LLM Analysis
+        logger.info("\nStep 2: LLM category discovery...")
+        discovered_categories, sample_labels = self.analyzer.discover_categories(sample_emails)
+
+        logger.info(f"Discovered {len(discovered_categories)} categories:")
+        for cat, desc in discovered_categories.items():
+            logger.info(f"  - {cat}: {desc}")
+
+        # Step 3: Label emails
+        logger.info("\nStep 3: Labeling emails...")
+
+        # Create lookup for LLM labels
+        label_map = {email_id: category for email_id, category in sample_labels}
+
+        # Build training set
+        training_data = []
+        for email in sample_emails:
+            category = label_map.get(email.id)
+            if category and category in self.categories:
+                training_data.append((email, category))
+
+        logger.info(f"Training data: {len(training_data)} labeled emails")
+
+        if not training_data:
+            logger.error("No labeled training data!")
+            return {'success': False, 'error': 'No labeled data'}
+
+        # Step 4: Train model
+        logger.info("\nStep 4: Training LightGBM model...")
+
+        # Prepare validation data
+        validation_data = []
+        for email in validation_emails:
+            # Use LLM to label validation set (or use heuristics)
+            # For now, use first category as default
+            validation_data.append((email, self.categories[0]))
+
+        try:
+            train_results = self.trainer.train(
+                training_data,
+                validation_emails=validation_data,
+                n_estimators=self.config.model_n_estimators,
+                learning_rate=self.config.model_learning_rate,
+                max_depth=self.config.model_max_depth
+            )
+
+            logger.info(f"Training accuracy: {train_results.get('training_accuracy', 0):.1%}")
+            if 'validation_accuracy' in train_results:
+                logger.info(f"Validation accuracy: {train_results['validation_accuracy']:.1%}")
+
+            self.results['training_results'] = train_results
+
+        except Exception as e:
+            logger.error(f"Training failed: {e}")
+            return {'success': False, 'error': str(e)}
+
+        # Step 5: Save model
+        if model_output_path:
+            logger.info(f"\nStep 5: Saving model to {model_output_path}...")
+
+            try:
+                self.trainer.save_model(model_output_path)
+                logger.info("Model saved successfully")
+                self.results['model_path'] = model_output_path
+
+            except Exception as e:
+                logger.error(f"Error saving model: {e}")
+                return {'success': False, 'error': f'Save failed: {e}'}
+
+        # Summary
+        logger.info("\n" + "=" * 80)
+        logger.info("CALIBRATION COMPLETE")
+        logger.info(f"Sample size: {len(sample_emails)}")
+        logger.info(f"Categories discovered: {len(discovered_categories)}")
+        logger.info(f"Training accuracy: {train_results.get('training_accuracy', 0):.1%}")
+        logger.info("=" * 80)
+
+        return {
+            'success': True,
+            'sample_size': len(sample_emails),
+            'categories_discovered': discovered_categories,
+            'training_results': train_results,
+            'model_path': model_output_path
+        }
+
+    def get_results(self) -> Dict[str, Any]:
+        """Get calibration results."""
+        return self.results
diff --git a/src/classification/embedding_cache.py b/src/classification/embedding_cache.py
new file mode 100644
index 0000000..2e200f7
--- /dev/null
+++ b/src/classification/embedding_cache.py
@@ -0,0 +1,167 @@
+"""Caching and batch processing for embeddings."""
+import logging
+import hashlib
+import numpy as np
+from typing import Dict, List, Tuple, Optional
+import json
+from pathlib import Path
+
+logger = logging.getLogger(__name__)
+
+
+class EmbeddingCache:
+    """
+    Cache embeddings to avoid recomputing.
+
+    Stores hash(text) → embedding mapping
+    """
+
+    def __init__(self, cache_dir: Optional[str] = None):
+        """Initialize cache."""
+        self.cache_dir = Path(cache_dir) if cache_dir else None
+        self.memory_cache: Dict[str, np.ndarray] = {}
+        self.hits = 0
+        self.misses = 0
+
+        if self.cache_dir:
+            self.cache_dir.mkdir(parents=True, exist_ok=True)
+
+    def _hash_text(self, text: str) -> str:
+        """Generate hash for text."""
+        return hashlib.md5(text.encode()).hexdigest()
+
+    def get(self, text: str) -> Optional[np.ndarray]:
+        """Get cached embedding for text."""
+        text_hash = self._hash_text(text)
+
+        # Try memory cache first
+        if text_hash in self.memory_cache:
+            self.hits += 1
+            return self.memory_cache[text_hash]
+
+        # Try disk cache
+        if self.cache_dir:
+            cache_file = self.cache_dir / f"{text_hash}.npy"
+            if cache_file.exists():
+                try:
+                    embedding = np.load(cache_file)
+                    self.memory_cache[text_hash] = embedding
+                    self.hits += 1
+                    return embedding
+                except Exception as e:
+                    logger.debug(f"Error loading cache {cache_file}: {e}")
+
+        self.misses += 1
+        return None
+
+    def set(self, text: str, embedding: np.ndarray) -> bool:
+        """Cache embedding for text."""
+        text_hash = self._hash_text(text)
+        self.memory_cache[text_hash] = embedding
+
+        # Optionally save to disk
+        if self.cache_dir:
+            try:
+                cache_file = self.cache_dir / f"{text_hash}.npy"
+                np.save(cache_file, embedding)
+            except Exception as e:
+                logger.debug(f"Error saving cache: {e}")
+                return False
+
+        return True
+
+    def get_stats(self) -> Dict[str, any]:
+        """Get cache statistics."""
+        total_lookups = self.hits + self.misses
+        hit_rate = (self.hits / total_lookups * 100) if total_lookups > 0 else 0
+
+        return {
+            'hits': self.hits,
+            'misses': self.misses,
+            'hit_rate': hit_rate,
+            'memory_cache_size': len(self.memory_cache),
+            'total_lookups': total_lookups
+        }
+
+    def clear(self) -> None:
+        """Clear memory cache."""
+        self.memory_cache.clear()
+        self.hits = 0
+        self.misses = 0
+
+
+class EmbeddingBatcher:
+    """
+    Batch process embeddings efficiently.
+
+    Processes multiple emails' embeddings in parallel.
+    """
+
+    def __init__(self, embedder, batch_size: int = 32):
+        """Initialize batcher."""
+        self.embedder = embedder
+        self.batch_size = batch_size
+        self.cache = EmbeddingCache()
+
+    def batch_encode(self, texts: List[str]) -> np.ndarray:
+        """
+        Encode texts in batches.
+
+        Returns:
+            Array of shape (len(texts), embedding_dim)
+        """
+        if not texts:
+            return np.array([])
+
+        embeddings = []
+
+        # Check cache first
+        uncached_indices = []
+        uncached_texts = []
+
+        for i, text in enumerate(texts):
+            cached = self.cache.get(text)
+            if cached is not None:
+                embeddings.append((i, cached))
+            else:
+                uncached_indices.append(i)
+                uncached_texts.append(text)
+
+        # Process uncached in batches
+        if uncached_texts:
+            logger.debug(f"Processing {len(uncached_texts)} uncached embeddings in batches of {self.batch_size}")
+
+            for batch_start in range(0, len(uncached_texts), self.batch_size):
+                batch_end = min(batch_start + self.batch_size, len(uncached_texts))
+                batch_texts = uncached_texts[batch_start:batch_end]
+                batch_indices = uncached_indices[batch_start:batch_end]
+
+                try:
+                    batch_embeddings = self.embedder.encode(
+                        batch_texts,
+                        convert_to_numpy=True,
+                        batch_size=self.batch_size
+                    )
+
+                    # Cache and collect
+                    for idx, text, embedding in zip(batch_indices, batch_texts, batch_embeddings):
+                        self.cache.set(text, embedding)
+                        embeddings.append((idx, embedding))
+
+                except Exception as e:
+                    logger.error(f"Error encoding batch: {e}")
+                    # Return zeros for failed embeddings
+                    for idx in batch_indices:
+                        embeddings.append((idx, np.zeros(384)))
+
+        # Sort by original index
+        embeddings.sort(key=lambda x: x[0])
+        result = np.array([e[1] for e in embeddings])
+
+        logger.debug(f"Cache stats: {self.cache.get_stats()}")
+
+        return result
+
+    def get_cache_stats(self) -> Dict[str, any]:
+        """Get cache statistics."""
+        return self.cache.get_stats()
diff --git a/src/processing/queue_manager.py b/src/processing/queue_manager.py
new file mode 100644
index 0000000..aba3525
--- /dev/null
+++ b/src/processing/queue_manager.py
@@ -0,0 +1,171 @@
+"""Queue management for LLM batch processing."""
+import logging
+import json
+from typing import List, Dict, Any, Optional
+from pathlib import Path
+from datetime import datetime
+from collections import deque
+
+logger = logging.getLogger(__name__)
+
+
+class LLMQueue:
+    """
+    Queue for emails awaiting LLM review.
+
+    Manages:
+    - Batching emails for efficient LLM processing
+    - Persistence to disk
+    - Processing status tracking
+    """
+
+    def __init__(self, batch_size: int = 50, persist_dir: Optional[str] = None):
+        """Initialize queue."""
+        self.batch_size = batch_size
+        self.persist_dir = Path(persist_dir) if persist_dir else None
+        self.queue: deque = deque()
+        self.processing: Dict[str, Any] = {}  # Currently processing batch
+        self.completed: List[str] = []  # Completed email IDs
+        self.failed: List[Dict[str, Any]] = []  # Failed items
+
+        if self.persist_dir:
+            self.persist_dir.mkdir(parents=True, exist_ok=True)
+
+    def add(self, email_id: str, email_data: Dict[str, Any]) -> None:
+        """Add email to queue."""
+        self.queue.append({
+            'email_id': email_id,
+            'data': email_data,
+            'added_at': datetime.now().isoformat(),
+            'retries': 0
+        })
+
+        logger.debug(f"Added to LLM queue: {email_id} (queue size: {len(self.queue)})")
+
+    def add_batch(self, items: List[tuple[str, Dict[str, Any]]]) -> None:
+        """Add multiple items to queue."""
+        for email_id, email_data in items:
+            self.add(email_id, email_data)
+
+        logger.info(f"Added {len(items)} items to LLM queue (total: {len(self.queue)})")
+
+    def get_batch(self) -> Optional[List[Dict[str, Any]]]:
+        """Get next batch for processing."""
+        if not self.queue:
+            return None
+
+        batch = []
+        for _ in range(min(self.batch_size, len(self.queue))):
+            batch.append(self.queue.popleft())
+
+        self.processing = {
+            'batch_id': f"batch_{datetime.now().isoformat()}",
+            'items': batch,
+            'started_at': datetime.now().isoformat()
+        }
+
+        logger.info(f"Got batch for processing: {len(batch)} items (queue remaining: {len(self.queue)})")
+        return batch
+
+    def mark_completed(self, email_ids: List[str]) -> None:
+        """Mark items as successfully processed."""
+        for email_id in email_ids:
+            if email_id not in self.completed:
+                self.completed.append(email_id)
+
+        logger.debug(f"Marked {len(email_ids)} items completed (total completed: {len(self.completed)})")
+
+    def mark_failed(self, email_id: str, error: str, retry: bool = True) -> bool:
+        """
+        Mark item as failed.
+
+        Returns:
+            True if should retry, False if should give up
+        """
+        # Find in processing batch
+        for item in self.processing.get('items', []):
+            if item['email_id'] == email_id:
+                item['retries'] += 1
+
+                if item['retries'] < 3 and retry:
+                    # Requeue for retry
+                    self.queue.append(item)
+                    logger.warning(f"Requeuing {email_id} (retry {item['retries']}/3)")
+                    return True
+                else:
+                    # Give up
+                    self.failed.append({
+                        'email_id': email_id,
+                        'error': error,
+                        'retries': item['retries'],
+                        'failed_at': datetime.now().isoformat()
+                    })
+                    logger.error(f"Failed to process {email_id} after {item['retries']} retries: {error}")
+                    return False
+
+        logger.warning(f"Failed item {email_id} not found in processing batch")
+        return False
+
+    def persist(self, filepath: str) -> bool:
+        """Save queue state to disk."""
+        try:
+            state = {
+                'timestamp': datetime.now().isoformat(),
+                'queue_size': len(self.queue),
+                'queue': list(self.queue),
+                'processing': self.processing,
+                'completed': self.completed,
+                'failed': self.failed
+            }
+
+            with open(filepath, 'w') as f:
+                json.dump(state, f, indent=2)
+
+            logger.debug(f"Queue state persisted to {filepath}")
+            return True
+
+        except Exception as e:
+            logger.error(f"Error persisting queue: {e}")
+            return False
+
+    def restore(self, filepath: str) -> bool:
+        """Restore queue state from disk."""
+        try:
+            with open(filepath, 'r') as f:
+                state = json.load(f)
+
+            self.queue = deque(state.get('queue', []))
+            self.processing = state.get('processing', {})
+            self.completed = state.get('completed', [])
+            self.failed = state.get('failed', [])
+
+            logger.info(f"Queue state restored from {filepath}")
+            logger.info(f"Queue size: {len(self.queue)}, Completed: {len(self.completed)}, Failed: {len(self.failed)}")
+            return True
+
+        except Exception as e:
+            logger.error(f"Error restoring queue: {e}")
+            return False
+
+    def get_stats(self) -> Dict[str, Any]:
+        """Get queue statistics."""
+        return {
+            'queue_size': len(self.queue),
+            'processing': len(self.processing.get('items', [])),
+            'completed': len(self.completed),
+            'failed': len(self.failed),
+            'batch_size': self.batch_size,
+            'total_processed': len(self.completed) + len(self.failed)
+        }
+
+    def is_empty(self) -> bool:
+        """Check if queue is empty."""
+        return len(self.queue) == 0 and not self.processing.get('items')
+
+    def clear(self) -> None:
+        """Clear all queues."""
+        self.queue.clear()
+        self.processing = {}
+        self.completed = []
+        self.failed = []
+        logger.info("Queue cleared")