v5.61.0

What's Changed

• feat(compaction): token-aware keep-window so /compact works on short-but-full sessions by @griffinwork40 in #667
• feat(router): notify the model when its provider is swapped mid-session by @griffinwork40 in #655
• feat(subagent): stamp a provenance header on cross-model subagent results by @griffinwork40 in #656

Full Changelog: v5.60.0...v5.61.0