FlowTux changelog: smarter triage and threaded Slack updates

A roundup of what shipped in the latest FlowTux release. Smaller items, but they add up to a sharper queue.

Repo indexing is faster and the code-findings ranking is more precise — fewer low-signal files, higher-confidence matches on the ones that matter.

Status changes now sync back into the originating Slack thread instead of a new message, so the conversation stays in one place from report to resolution.