Closes 3 of 6 UX-round1 fixes in one TDD cycle (49→56 tests).
drawer-bundle-md: TaskRecord.md_content fetched in build-time;
drawer reads recordsBySlug instead of fetch — 0 runtime hits to
git.kzntsv.site/raw (private repos 401'd browser fetches without token).
Fallback dl-block when md=null.
ux-show-slug: <code class="card-slug"> rendered under card-title in
both render.ts and board.js renderCard (re-render path).
ux-owner-conditional: distinctOwner(records) pre-scan. Single owner →
pill omitted on cards, header gets <span class="owner-summary">
Owner: X</span>. Multi-owner → pill restored, no header summary.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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