ui: redesign the new-construct form as a contained panel with source cards

ui: three explicit construct paths + Save gating + visible AI drafts

docs: AI item-drafting scenarios in /guide and MANUAL_TESTING.md

feat: Implement multi-construct functionality in CCR analysis

Enable Row-Level Security on public tables in Supabase at startup

Refactor admin page to include collapsible sections and enhance invite link management

Four-tier access model: self-governing admin, pre-login access, audit trail

Repro script: valid Python booleans + per-run filenames in instructions

Admin page v1: user roles (lab tier), password resets, failed-run requeue, verification queue

Refine documentation and fix upload handling

Apply PI decisions: full construct library (rights approved), anon cap 200, drop CRS

Sync platform from lab mainline: dev instance ready to deploy