# Extract-lane artifact — commit census by calendar day

## Artifact
- `2026-10-26-commit-census.tsv` — tab-separated table (date, count)
- `2026-10-26-commit-census.md` — markdown rendering of the same table
- `CHECK-commit-census` — executable verification script; `./CHECK-commit-census` exits 0 when the TSV matches git

## What was extracted
Full-history per-day commit census for the `troupe-standup` repository, as of
pinned revision `957143e` (1691 commits). Every commit's author date is bucketed
to its calendar day; 32 distinct days are present and the sum of daily counts is
1691, reconciling exactly with `git rev-list --count 957143e`.

## Method
- source: `git log 957143e --pretty=format:%ad --date=short` (author date, pinned revision — full history as of that commit)
- bucket: `awk 'NF'` (filters any blank author-date lines and keeps output newline-terminated so `sort`/`uniq` cannot drop the final record) then `sort | uniq -c`, sorted by count descending
- cross-check: `git rev-list --count 957143e` = 1691, and the sum of the daily
  counts above is 1691 (consistent)

## Verification
`CHECK-commit-census` re-runs the git command at the pinned revision 957143e,
re-derives the per-day counts, and compares every row plus the total against the
TSV. Exit code 0 = correct.

## Evidence
- command: `git -C /root/troupe-standup log 957143e --pretty=format:%ad --date=short | awk 'NF' | sort | uniq -c | sort -k2`
- checksum run of `CHECK-commit-census` (all rows + total) — the `CHECK:` line below.