Follow-up to the #39227 salvage: config refreshes fire mid-session too
(gateway events, settings saves), so applying terminal.cwd
unconditionally would yank the workspace out from under an attached
session. Gate the override on activeSessionIdRef like the sibling
reasoning/tier settings, keep branch refresh on the live cwd, and add
coverage for the active-session path. Also lint-polish the new test
file (typed config mock, prettier formatting).
36b7e5e9cc