fix(think): resolve messenger self-mentions

[cjol]

This PR rewrites Think messenger self-mentions before they reach the model. It replaces the bot's own unresolved raw user-id mention with the configured bot handle in Chat SDK messenger events.

Why

• Mention-triggered messenger messages can start with the bot's own platform id, for example @U0BD9EYL52S, after adapters resolve other users to readable names.
• Small models can misread that unresolved id as a third party the sender wanted to contact, rather than as the bot mention that triggered the event.
• The existing userName messenger option already represents the readable bot handle, so the fix can reconstruct @<userName> without adding configuration.
• Rewriting is limited to adapters that expose botUserId; handle-based adapters already produce readable mentions and are left unchanged.

Public API Surface

Symbol	Kind	Notes
resolveSelfMention	Function	Additive export from @cloudflare/think/messengers that rewrites <@id>, <@!id>, and bare @id self-mentions to @<userName>.

Code Changes

• defaultChatSdkEvent now normalizes the message once, rewrites the bot self-mention, and passes the rewritten message into the messenger event.
• resolveSelfMention handles Slack and Discord angle-bracket mention forms plus the bare @id form some adapters normalize to.
• Messenger docs explain why self-mentions are rewritten and when the behavior applies.
• The changeset marks this as a patch fix for @cloudflare/think.

[changeset-bot]

🦋 Changeset detected

Latest commit: 03e5e8e

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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