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fix(sessions): share the change-feed mirror between hosts (#2205) - #2404
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Adds session.mirror(), the one reduction AIChatAgent and Think each carried a copy of. Think keeps its branch, compaction and prompt-refresh handling through the intercept and onApplied hooks. Co-authored-by: Cursor <cursoragent@cursor.com>
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Fixes #2205.
Problem
AIChatAgentandThinkeach carried their own copy of the reduction that keeps an in-memory transcript in step with the Sessions change feed. That covers upserting on append and update, filtering on delete, and emptying on clear. The two copies had already drifted in small ways.Fix
A new
session.mirror({ get, set, transform?, intercept?, onApplied? })applies the shared reduction for one session:get()is read on every event, so a host that reassigns its array is followed rather than shadowed.interceptlets a host handle an event itself.onAppliedreports each write together with the entry it replaced.AIChatAgentuses the plain form.Thinkkeeps its own behavior exactly through the hooks: branch appends resync, imports mark the cache stale, compaction resyncs and refreshes the prompt, and linear appends still drive growth accounting and media-eviction bookkeeping.Tests
mirrortests intests/sessions/capability.test.tscover the reduction, reassignment, theonAppliedlog,intercept, other sessions, and unsubscribe.