SDK-391 Continue legacy Pi sessions in bt-daemon

[Stephen Belanger (Qard)]

Summary

• read validated continuation state from the pre-daemon Pi extension
• adopt its existing root and cumulative counters rather than creating a second root
• cover the adapter handoff, translator continuation, and fail-open state parsing

Validation

• pnpm --dir src/plugins/pi/content test
• pnpm --dir src/plugins/pi/content check
• cargo test --manifest-path bt-daemon/Cargo.toml --test pi_translator
• cargo fmt --manifest-path bt-daemon/Cargo.toml --check

cargo test --manifest-path bt-daemon/Cargo.toml --all-features remains blocked by existing tests/codex_translator.rs initializers missing the required span_plugins field.

[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-23T18:26:08.370651Z	63505eb	Draft marked ready

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 63505eb167

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