Add design and product documentation

PRODUCT.md

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+# Product — FreightOps Control
+
+Status: approved baseline.
+
+## Audience and job
+
+Dispatchers and operations leads need to detect exceptions, understand shipment state, coordinate routes and returns, and act with an auditable operational picture.
+
+## Primary journeys
+
+1. Scan fleet and shipment health, alerts, and service-level risk.
+2. Filter and inspect shipments, routes, returns, and responsible operators.
+3. Resolve or escalate an exception and verify the resulting state.
+
+## Non-goals
+
+- No marketing landing-page patterns inside operations screens.
+- No charts or statuses without definitions, timestamps, and empty/error states.
+
+## Success criteria
+
+Critical exceptions are visible quickly, tables remain usable at realistic density, and every action has feedback and audit context.