Replace the keyword/source-majority Interest system with a StoryPill enum that
matches stories by canonical category slugs. StorySummary gains a tolerant
tags[] (optional, decode-safe); effectiveTags uses tags, falling back to topic
during the backend transition. No more headline keyword-searching on the client —
the backend decides classification; the client asks slug membership.
Pills: All, F1, Sport, AI, Cloud, HomeLab, Tech, Uganda, South Africa, Canada, US.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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