v2.6.4 — Differentiated Digest Periods

Fixes

• Digest periods now differentiated: 3 months=10 items, 6 months=15, 12 months=20 per category
• Year fallback: entries with backfilled discovered_at now correctly appear in wider time windows
• NoneType fix: entries with null stars no longer crash the digest generator
• Regenerated: 3m=220, 6m=330, 12m=440 total items. Tab sizes: 339/449/559 lines

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