Append-only journal of finished work bulks, so anyone (human or agent) can catch up fast. Newest at the BOTTOM. Append an entry whenever a bulk of work wraps (ideally right before the commit that ships it). Keep entries SHORT: header line + What + Refs, nothing else.
Entry grammar (strict, one header line per entry):
## YYYY-MM-DD · Short title · #tag1 #tag2
What: 1-2 lines, outcome first.
Refs: [doc](path) (new|updated), repo PR/commit links.
Tags (reuse before inventing): add your own as loops emerge, e.g. #analysis #product #content #infra #skill #research #ops #revenue #growth
Retrieval recipes (macOS; entry headers always start ## 20):
# index of all entries (one line each)
grep '^## 20' LOG.md
# last 5 entries, full
tail -r LOG.md | awk '{print} /^## 20/{c++; if(c==5) exit}' | tail -r
# all entries about a topic
awk '/^## 20/{p=/#product/} p' LOG.md
# entries from a month
awk '/^## 20/{p=/^## 2026-06/} p' LOG.md