fix(daemon): yield commit roots waiting on editors

[svarlamov]

Summary

• detect trace2 commit-message editor waits without adding work to the critical ingestion path
• let completed same-family operations pass only while the commit parent is blocked in that editor
• keep rebase editors and roots with nested mutating Git children as strict ordering barriers

Tests

• deterministic TestRepo daemon regression for an editor-blocked commit followed by a completed commit
• safety regression proving an editor-blocked rebase still blocks later mutations
• task lint
• task fmt
• task test TEST_FILTER=waiting_for_editor

The full local suite passes all 2,155 library tests and all new/other daemon tests. Four existing await/telemetry tests fail identically on clean main and are unrelated to this change.

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