Preserve goal context during compaction#22174
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Summary
Goal continuation steering is hidden user context, but compaction still filtered contextual user messages unless they parsed as visible user messages or hook prompts. That can let an older real user steer regain salience after compaction, which is the failure mode described in #21291.
This PR adds a generic opt-in on
ContextualUserFragmentfor fragments that should survive compaction.GoalContextopts in, local compaction preserves those contextual user messages when rebuilding user-message history, and remote compaction keeps them through the same retention path used for hook prompts.