Add design and product documentation

DESIGN.md

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+# Design — Juniper Table
+
+## Direction
+
+Seasonal editorial hospitality: warm natural color, tactile food imagery, refined type, and booking-led composition without luxury clichés.
+
+## System
+
+- Let menu typography and photography lead; avoid repetitive promotional cards.
+- Booking controls expose availability and validation states clearly.
+- Motion is slow and restrained, never delaying access to menu or booking.
+- Mobile places service window, party size, allergy context, and confirmation expectations in sequence.

PRODUCT.md

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+# Product — Juniper Table
+
+Status: approved baseline.
+
+## Audience and job
+
+Diners and event hosts need to understand the seasonal menu, service windows, seating formats, allergy handling, and booking confirmation process.
+
+## Primary journeys
+
+1. Explore current menu, sourcing, pairing, and dining format.
+2. Choose a valid date, time, party size, and seating option.
+3. Disclose relevant allergies or request private dining and understand host confirmation.
+
+## Non-goals
+
+- No guaranteed availability, hidden service terms, or unsupported instant confirmation.
+
+## Success criteria
+
+Menu and booking information stay current and legible, constraints are visible before submission, and private dining has a distinct qualified path.