feat: First starter case - The Stolen Lunch

- Case: easy-01-the-stolen-lunch
- Plot: Office lunch theft, 2 suspects
- Evidence: Email + Fridge photo (placeholders)
- Suspects: Alex Chen + Jordan Park
- 4 images (placeholders for testing)
- truth.enc: base64 encoded

Note: Images are placeholders for flow testing.

cases/easy-01-the-stolen-lunch/case.yaml

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+title: "The Stolen Lunch"
+
+briefing:
+  narrative: |
+    It's 12:30 PM. You just got back from a meeting to find your 
+    lunch missing from the office refrigerator. Your lunch box 
+    had your name on it.
+
+    You reported it to HR. Two people were in the office kitchen 
+    area around lunch time. HR has provided some evidence and 
+    two suspect profiles.
+
+    Find out who took your lunch.
+
+evidence:
+  - id: "evidence-01"
+    name: "Office Email"
+    image: "images/evidence-01.jpg"
+    description: "Email sent by one of the suspects earlier that morning"
+
+  - id: "evidence-02"
+    name: "Refrigerator Photo"
+    image: "images/evidence-02.jpg"
+    description: "Photo of the office refrigerator taken after the incident"
+
+suspects:
+  - id: "suspect-01"
+    name: "Alex Chen"
+    photo: "images/suspect-01.jpg"
+    description: |
+      Your desk neighbor. Asian woman, early 30s.
+      Works in marketing. You've spoken a few times.
+      Was in the office this morning.
+
+  - id: "suspect-02"
+    name: "Jordan Park"
+    photo: "images/suspect-02.jpg"
+    description: |
+      Works in accounting, floor below.
+      Was visiting for a meeting. No prior connection to you.
+      Was seen in the kitchen area around lunch time.