Cobb wants rustypipe primary, yt-dlp fallback, and rip-to-temp as the
last-resort path when streams die mid-play. README expanded to spell
out all three tiers + adds the 'fight YouTube alongside the FOSS
ecosystem' framing. MILESTONES M1 rewritten to cover all three tiers.
New file docs/upstream.md tracks every PR we file against rustypipe /
NPE / yt-dlp with honest outcomes. Opens empty; fills as M1+ surface
real bugs to fix.
