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a9d73bcbfb
* fix(security): eliminate polynomial ReDoS in comboAgentMiddleware <omniModel> regex (CodeQL js/polynomial-redos) CACHE_TAG_PATTERN wrapped the tag in an unbounded `(?:\\n|\n|\r)*` prefix/suffix. On an unanchored `.test()`/`.exec()` that is O(n²) on inputs with many newlines (CodeQL js/polynomial-redos, alerts #612/#613). The surrounding runs are irrelevant to detecting/capturing the tag, so the detection pattern now matches only the core `<omniModel>([^<]+)</omniModel>`; the global strip pattern still consumes the wrapping newlines (combo.ts streaming, #531) but BOUNDED ({0,16}) so it stays linear. Behavior preserved: detection, model extraction, multi-tag stripping (#454) and blank-line cleanup all unchanged (107 related tests green). Adds ReDoS-safety regression tests (50k-newline inputs complete in <1ms). * docs(changelog): add #3982 ReDoS fix to [3.8.27]