tool-pwsh-persistent installs its own `prompt` function after spawn, so
terminal-bash prompt readiness never matched and every send degraded to the
silence tier (idleSilenceMs + handoffGraceMs) under production defaults. This
is the defect the persistent bash tool fixed for the bash stack.
The tool now initializes without a prompt send and detects the no-end-marker
fallback through the seam's stdin_read wait reason instead of matching its own
prompt text. The private prompt constant and its stripping are deleted, so
partial output can carry the backend's own trailing prompt.
Tool calls drop from 8493/3722/3832/3759 ms to 1340/255/251/241 ms (spawn and
initialization plus the first command, then three warm commands; Windows,
production defaults, real Loader composition). The loader composition suite
pushes idleSilenceMs beyond the send bound, so every case fails if prompt
readiness regresses.
Huanqi Cao
97545d9c8f