Potential experiments

fix(gateway): drop the channel engine on an empty range list (#2278)

fix(worker): keep attachment decay state on a stale expiry row

fix(gateway): release the user session count on a handoff fence

fix(gateway): stop a non-map opcode payload crashing the socket (#2277)

fix(gateway): clamp a heartbeat ack to the session sequence

fix(gateway): keep the replay buffer across a session transfer (#2276)

fix(worker): catch up cron jobs missed by a delayed tick (#2275)

fix(worker): drain in-flight jobs before the runner stops (#2274)

fix(gateway): flush buffered presences in arrival order (#2273)

fix(cache): refcount produce tracking so deletes are not lost (#2272)

fix(ci): install rustup before use on cold runners

fix(desktop): accept array-form AppRun sandbox fallback (#2271)

feat(markdown): replace the dart parser with the native parser

feat(ci): improve firebase lab action

Merge remote-tracking branch 'origin/canary' into canary

fix(ci): environment flag

chore(ci): provision rust and native assets in build jobs

feat(markdown): enable the native parser by default on canary

fix(api): enforce guild bans when approving registrations (#2270)

feat(ci): add Firebase Test lab