docs(phase9): design spec for polish debt
Covers six roadmap items plus Phase 8 carryover backlog: save dialog,
bulk export, LLM content tags, progressive-disclosure Settings, visual
polish, accessibility sweep. Decisions locked 2026-04-24: on-demand
stored LLM tags with grammar-constrained topic + intent closed set;
Settings regrouped into one always-expanded "Start here" plus six
collapsed details groups; polish and a11y kept to bounded checklists.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Jake
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