Add digest command to email processor

Read-only summary of recent decisions, grouped by action with
[auto]/[user] markers. Supports --recent N for multi-day lookback.

scripts/email_processor/README.md

@@ -60,6 +60,7 @@ The system separates **classification** (what the LLM does) from **confidence**
 - **Repeat senders** with consistent tag signatures reach 85%+ confidence and get auto-acted during `scan`. They never touch the pending queue.
 - **New or ambiguous senders** start at 50% and get queued.
 - **You occasionally run `review list`** to handle stragglers — each decision further builds history.
+- **`digest` gives a quick glance** at what was processed recently — subject lines grouped by action, with `[auto]`/`[user]` markers.
 - **`stats` shows your automation rate** climbing over time.
 
 ### Confidence Computation
@@ -96,6 +97,10 @@ chmod +x email-processor.sh
 ./email-processor.sh review all delete             # delete all pending
 ./email-processor.sh review accept                 # accept all suggestions
 
+# --- Digest ---
+./email-processor.sh digest                       # today's processed emails
+./email-processor.sh digest --recent 3            # last 3 days
+
 # --- Other ---
 ./email-processor.sh stats                        # show decision history
 ```
@@ -244,13 +249,16 @@ ollama list  # should show kamekichi128/qwen3-4b-instruct-2507:latest
 
 # 7. Check that the decision was recorded
 ./email-processor.sh stats
+
+# 8. Quick glance at what was processed today
+./email-processor.sh digest
 ```
 
 ## File Structure
 
 ```
 email_processor/
-  main.py              # Entry point — scan/review/stats subcommands
+  main.py              # Entry point — scan/review/stats/digest subcommands
   classifier.py        # LLM prompt builder + response parser, tag taxonomy
   decision_store.py    # Decision history, confidence computation, few-shot retrieval
   config.json          # Ollama + automation settings