Comment cleanup: short Russian why-comments, no AI boilerplate

Medium wave 4: validated env numbers, Upstash backend and shutdown flush tests, deno check/lint in CI, reproducible pip step, docs for missing variables

Luna audit round 2: review fixes (regex bounds, mixed albums, redaction guards)

Luna audit fixes: album lock, multilingual routing, streaming budget, quota and persistence hardening

Comment polish: Russian pro-style comments, keep dated evidence short (+426/-2765). Fix: bot.send_chat_action -> bot.bot.send_chat_action (was AttributeError, typing indicator never showed)

P2: extract lumen_limits.py (rate window + pick queue) with bot.X re-exports (AUD-A-001)