refactor(session): effectify SessionCompaction service - #19459
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Migrate SessionCompaction to Effect service pattern with Bus.Service and Config.Service as layer dependencies. Bus.publish for Compacted event now goes through the Effect service instead of raw call.
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Pure structural refactor — no Effect yet. Extracts the switch statement into a standalone handleEvent function and the cleanup section into a cleanup function. ProcessorContext object shares mutable state via getters/setters. Zero behavior change (verified by two review agents).
Replace the while(true) + for-await + try/catch pattern with: - Stream.fromAsyncIterable + Stream.runForEachWhile for event consumption - Recursive Effect for retry logic (preserves SessionRetry.delay backoff) - Effect.ensuring for cleanup guarantees - Effect.catch for error classification process() still returns Promise externally (via Effect.runPromise) so callers don't change. Event handling and cleanup logic unchanged.
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Co-authored-by: ian-morgan99 <106852423+ian-morgan99@users.noreply.github.com>
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Summary
Compactedevent now goes through Effect Bus.Serviceprocess()body kept as Effect.promise (complex async with Agent/Provider/Plugin calls)isOverflowandprunefully effectified with config.get() via EffectTest plan
bun run typecheckpassesbun run test— 1596 pass, 0 fail