v3.9.1: Impact statusline for agents

Fallow Impact in your status line

fallow impact statusline gives agent and editor chrome one compact, path-free
line with the latest whole-project issue count, its trend, and findings cleared
while Impact was tracking. It reads local history only, never runs analysis,
migrates data, records telemetry, or prints normal CLI notices.

The Fallow plugin for Claude Code can compose this line with an existing status
line. Codex and other agents can use the same stable command through the bundled
Fallow skill.

Cloud runtime confidence

Cloud never_called evidence now keeps its provenance. Runtime-observed
functions can retain the existing high-confidence deletion recommendation,
while inventory-backed, missing, and future provenance remains conservative.

Full Changelog: v3.8.1...v3.9.1