feat: initialize cold display guard

findings.md

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+# Findings
+
+## Existing Local Context
+
+- `~/Code/video_recognition_local/store_dwell_alert` exists, but it tracks people dwell time, not food batch dwell time.
+- The new project should be independent and should not share git history with the existing project.
+
+## Domain Model
+
+- The reliable business unit is a display-zone batch, not an individual food item.
+- A batch starts when a zone changes from empty to occupied.
+- A batch continues while the zone remains occupied, even if the item count decreases.
+- A batch ends when the zone becomes empty.
+- If a batch is removed after the maximum dwell threshold, the system expects a trash-bin deposit event within a configurable window.
+- If a removed over-threshold batch reappears in any display zone before being discarded, that is a violation.
+- If food is added while a zone is already occupied, that is a mixed-batch violation.