Shell & Micro-Frontend UX Coherence — Refactor Plan

Sequence the eight locked decisions from the UX Coherence spec into five phases that land on `refactor/ux-streamlining`. Foundation first (Deck→Flow rename so every later phase speaks the right vocabulary), then mechanical polish that's independently shippable (peek labels, pack-selection helpers, off-mode hide), then the hierarchical Flow widget (bubble progress strip + icon-tooltip layout sub-options), then 'Augment This Set' with the record-set pre-selection unification, then harvest the cross-cutting principles into a living doc. Architectural open questions (enrichment-surface composition, Flow-widget default position) are spiked but not allowed to block the visible UX wins.