v0.19.1

Patch: locale-proof pidfile identity — on non-C-locale macOS, tesserae doctor misread a live engine daemon as a stale pidfile (ps -o lstart= renders locale-dependently) and --fix offered to delete it out from under the running daemon. The ps invocation is now pinned to LC_ALL=C and pidfiles written by earlier builds are rescued by an exact command-line match (the rescue can only widen 'alive', never declare a live owner stale). Full notes: docs/release-notes/v0.19.1.md (7 translations included).