Type OpenCode translator event deserialization

[Stephen Belanger (Qard)]

Summary

• deserialize OpenCode tool, message-part, and message-completion event subsets into private DTOs
• retain raw JSON for opaque message and tool payloads while preserving raw journal envelopes
• cover ignored future fields and malformed typed events

Validation

• cargo fmt --manifest-path bt-daemon/Cargo.toml -- --check
• cargo test --manifest-path bt-daemon/Cargo.toml --all-features --locked
• cargo clippy --manifest-path bt-daemon/Cargo.toml --all-targets --all-features --locked -- -D warnings
• git diff --check

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-09T15:16:16.000371Z	b17189c	PR opened

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: b17189cde8

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