The function _persist_live_session_system_prompt runs on the RPC
dispatcher thread. A model switch calls it. On that thread the
_SESSION_CWD contextvar is not set. Because of this,
resolve_agent_cwd() falls back to the process TERMINAL_CWD value.
The desktop pins TERMINAL_CWD to the home directory. The rebuilt
prompt then records the home directory as the working directory.
The wrong prompt persists to the session database. Later turns
restore the stored bytes without change, because the turn prologue
rebuilds the prompt only when the cache is empty. The wrong line
never heals. The terminal tool is not affected, because it reads
the per-session cwd record.
The desktop composer sends a model switch before the first turn
when its model differs from the config default. Because of this,
a new project session can show the wrong working directory for
its full life.
Fix: bind the session context around the rebuild, in the same way
the function already binds the profile home for issue #50233. The
test drives the real function from a bare thread and asserts the
persisted prompt carries the session cwd.
ethernet
cbd8de8ad6