add LOG.md auto-maintenance: src/log_md.zig, snapshot exclusion, init/save/checkpoint/tag/promote/undo wiring, build.zig, man.txt, AGENTS.md, 28 regression tests (v1.9.0)

dev · 6 weeks ago · 2026-05-03 · 10.0 MB

$ koh steal kepr.uk/koh@f9d4306e3bab