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Make thread-owned Guardian context always enabled - #47686
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## What changed - Deprecate and ignore `features.guardianv2.thread_context`, including profile overrides, with a migration notice. Ignore managed requirements for the removed flag with a warning. - Preserve surviving legacy root instructions across compaction and resume when retained instructions are incomplete. Include unmatched instructions in worker authorization context with an explicit unknown-ordering notice, without replacing newer retained facts or expanding the reviewer's model window. - Use surviving source calls to roll back verified answers from older checkpoints that lack acceptance-order metadata. ## Testing Add regression coverage for legacy instruction recovery, compaction and resume, source matching, and answer rollback around same-turn user input. Update configuration and Guardian review tests to verify that the deprecated opt-out still uses thread-owned context and rejects incompatible compaction evidence. GitOrigin-RevId: a65936c9e0b912e7667d1385a2ec53df726565de
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Make thread-owned Guardian context always enabled
What changed
features.guardianv2.thread_context, including profile overrides, with a migration notice. Ignore managed requirements for the removed flag with a warning.Testing
Add regression coverage for legacy instruction recovery, compaction and resume, source matching, and answer rollback around same-turn user input. Update configuration and Guardian review tests to verify that the deprecated opt-out still uses thread-owned context and rejects incompatible compaction evidence.