Fix awaitMatch helper on collection inserts and export isChangeMessage

[KyleAMathews]

Two issues fixed:

1. isChangeMessage not exported: The isChangeMessage and isControlMessage utilities were exported from electric.ts but not re-exported from the package's index.ts, making them unavailable to users despite documentation stating otherwise.

2. awaitMatch race condition on inserts: When awaitMatch was called after the Electric messages had already been processed (including up-to-date), it would timeout because:

   • The message buffer (currentBatchMessages) was cleared on up-to-date
   • Immediate matches found in the buffer still waited for another up-to-date to resolve

   Fixed by:

   • Moving buffer clearing to the START of batch processing (preserves messages until next batch)
   • Adding batchCommitted flag to track when a batch is committed
   • For immediate matches: resolve immediately only if batch is committed (consistent with awaitTxId)
   • For immediate matches during batch processing: wait for up-to-date (maintains commit semantics)

Fixes issue reported on Discord where inserts would timeout while updates worked.

🎯 Changes

✅ Checklist

• I have followed the steps in the Contributing guide.
• I have tested this code locally with pnpm test:pr.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[changeset-bot]

🦋 Changeset detected

Latest commit: 39d4df4

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@tanstack/electric-db-collection	Patch

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commit: 39d4df4

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Total Size: 88.2 kB

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