Notify team when appraisal stage advances for deal

Appraisal stage changes that go unannounced leave reps without deal context and slow handoffs. It posts a channel alert so deal owners can respond the same day.

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Overview

Critical appraisal stage changes often stall deals when owners aren't informed. This flow publishes a concise channel alert with the opportunity reference and owner mention so managers and reps can re-engage within minutes and keep pipeline momentum.