fix stale initial chat URL on agent switch

[threepointone]

What changed

• suppress useAgent().getHttpUrl() while a room change is still rendering against the previous PartySocket
• defer initial-message loading until the socket matches the new logical Agent address
• derive loader identity from the intended leaf address for ordinary room/sub-agent routing
• preserve server-routed basePath behavior
• add a browser/Worker regression that changes both the Agent name and auth query

Why

On an Agent name change, useAgentChat could key a new initial-message request under the new conversation while getHttpUrl() still returned the previous socket URL. That sent the previous auth token to the new logical request and cached the old conversation under the new key.

Fixes #1864.

Validation

• regression reproduced before the production fix: the new logical address loaded through the old path/token
• focused regression passes after the fix
• Agents React project: 10 files, 124 tests passed
• affected Agents and React-test TypeScript projects pass
• repository export, formatting, and lint checks pass

The repo-wide check wrapper attempted to reinstall existing node_modules and was declined; its individual checks were run directly. The full typecheck wrapper could not resolve tsgo from its subprocess PATH, so the affected TypeScript projects were run directly and passed.

[changeset-bot]

🦋 Changeset detected

Latest commit: 46dfa5b

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

This PR includes changesets to release 2 packages

Name	Type
agents	Patch
@cloudflare/agent-think	Patch

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commit: 46dfa5b