In long-running agent workflows with repeated context compaction, empirical gateway ablations across 132 real sessions revealed that standard boundary compliance remains robust, while semantic drift can occur when model-generated summaries rephrase literal approval phrases and action conditions.
This change converges PR #8114 into a clean built-in summary prompt enhancement:
- Replaces regex extraction, tag elevation, and heuristic revocation with an extended built-in DeerFlow summary prompt (_DEERFLOW_SUMMARY_PROMPT).
- Instructs the summarizer to faithfully record active user requirements, literal approval phrases, permitted actions, and later explicit revisions without paraphrasing.
- Treats summary text strictly as historical data, fully preserving the security boundary and control/data plane separation of DurableContextMiddleware.
- Unifies automatic and manual compaction factory paths to select the built-in template when unconfigured, while preserving explicit summary_prompt precedence.
- Adds comprehensive sync/async unit tests covering built-in and custom templates.
Co-authored-by: Totoro <Totoro-qaq@users.noreply.github.com>
Co-authored-by: Totoro <msy626836554@gmail.com>
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