fix(think): preserve active transcript during repair

[ben-reitz]

Stacked on #2038.

Problem

Think can repair provider-normalized messages for a selected model branch. That repair path also replaced _cachedMessages with the selected branch, even when it was not the active client-visible transcript. Regenerating from an older branch could therefore make connected clients lose or switch away from their live branch.

Fix

• persist provider-normalized rows for the selected model history
• patch matching rows in the active Session cache
• never install arbitrary branch history as the client-visible transcript
• keep WebSocket broadcasts scoped to the active transcript

Testing

• 88 client-tools tests
• regression forces provider repair during sibling regeneration and verifies the repaired row, active transcript, WebSocket broadcast, and previous sibling

Stack

1. fix(agents): keep session compactions branch-local #2120 — Session branch-local compaction
2. fix(think): preserve regeneration branch context #2038 — Think regeneration context
3. This PR — transcript repair ownership
4. fix(think): preserve branches during recovery #2122 — branch-aware recovery
5. fix(think): preserve regeneration branches after restart #2057 — restart durability

[changeset-bot]

🦋 Changeset detected

Latest commit: f550e0f

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

This PR includes changesets to release 2 packages

Name	Type
@cloudflare/think	Patch
@cloudflare/agent-think	Patch

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.

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commit: 2112f98