v0.1.421

What's Changed

• fix(653): stale auto-compacted marker on the busy row after the fold finishes by @vabhzw17eg2qu4m9-bit in #658
• perf(503): boundary walk reads single-pass blocks — 10.3s → 3.0s on a 396 MB tail by @ai-teammate in #660
• fix(647): messaging delivery SLO <=2s — warm wake, universal yield, steering/Ctrl+S AC1-AC6 by @vabhzw17eg2qu4m9-bit in #661
• fix(machine): drop accidental factory-agents gitlink; ignore the runtime clone by @IstiN in #655

Full Changelog: v0.1.420...v0.1.421