fork of prime agent with changes i want but are not upstreamable probqbly (and some fixes)

fix(coding-agent): persist custom working message across loader recreation master

Replace transient pendingWorkingMessage with a persistent workingMessage field on InteractiveMode, matching the workingIndicatorOptions pattern. New loaders now use this.workingMessage || this.defaultWorkingMessage instead of always falling back to the default. Also add working-message-test.ts extension example. closes #3566


+33 -13
3 changed files