Bump bt-daemon for bounded coding-agent message history

[Stephen Belanger (Qard)]

Pins bt-daemon to braintrustdata/braintrust-coding-agent-plugins#51.

This brings in:

• fire-and-forget hook capture after the durable journal boundary
• compaction-aware LLM message windows across supported agents
• delta-encoded Pi context journaling and bounded streaming-update records

The PR CI build artifacts can be used for customer testing on macOS.

Depends on braintrustdata/braintrust-coding-agent-plugins#51.

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Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-04T19:37:04.499572Z	8f30e5e	PR opened

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