feat: update changelog

Author: kaeun97

docs/changelog.md

@@ -6,6 +6,7 @@ _This project uses semantic versioning_
 
 ## 13.1.0 (2026-03-25)
 
+- Add Python-friendly `RunReport` wrapper that returns `CommandDecl` objects as rule keys instead of raw egglog s-expression strings, with pretty-printed Python syntax in `str()` output [#416](https://github.com/egraphs-good/egglog-python/pull/416)
 - Improve high-level Python ergonomics and docs [#397](https://github.com/egraphs-good/egglog-python/pull/397)
   - Add `EGraph.freeze()`, returning a `FrozenEGraph` snapshot that can be pretty-printed back into replayable high-level Python actions for debugging and inspection.
   - Add a variadic `EGraph(*actions, seminaive=True, save_egglog_string=False)` constructor so actions can be registered at construction time, and export `ActionLike` from `egglog` for typing code that works with `EGraph.register(...)` and the constructor.