v0.9.0 — 2026-09-27

The release where bb scan takes half the time on a large tree, and
bb sentinel runs everything free before it spends on an agent.

Added

bb sentinel (#82, #84). Runs every check that needs no model first,
then hands only what is left to agent lanes inside the daily budgets. #84
adds the Python policy, kernel ops, and links into lathe and arc.
bb pipeline tail and a console gears panel (#79). tail streams gear
runs and stages from gear_runs.jsonl and episodes.jsonl until Ctrl-C
(--gear, --verbose, --json). The console shows runs per gear over 24h,
7d and all time, with failures, average seconds and the latest 15 runs.
Bench page changes and new tests for doctor, drivers, facts, packs, ratify,
swebench and six expert modules (#81).
One-page pitch, deck and PDF under docs/pitch/ (#70).

Scan and pinpoint performance (#71 to #76). On a shallow clone of django
(7,091 files) bb scan went from 22 s to about 11 s. Each file is hashed and
counted once, five detectors stop rescanning the corpus per candidate, the
kernel's dupes keys windows by interned line ids, resolve() memoises by
spec, and a per-file cache keyed by content sha1 carries single-file
derivations between scans. importGraph and dead-deps read import specs
through that cache (#77, #78).
Findings noise (#80). Open findings on this tree went from 826 to 192. A
window where half or more rows are a bare string literal is no longer a
duplicate block, in JS and in the kernel. oversight:god-file and
oversight:duplication no longer reach the findings board. bb findings
defaults to 20 rows, most-committed files first within a severity.
The cut-file prompt suggests a pasteable bb pinpoint command (#83, #86).

orient skips arc build when the arc binary is absent. An npm install
ships no binary, and this was 104 of orient's 119 recorded failures (#79).
bb waits for stdout and stderr to flush on exit. bb findings --json | …
stopped at 65,536 bytes (#81).

test/doctor.test.js fails on Windows: the repository row reports warn
for a workspace whose git lives in a subdirectory. The release gate runs on
Ubuntu.
A kernel installed before this release reports help tables as duplicate
blocks. bb kernel install fetches the new one.