docs(mimic-iv): link README(s) to chartevents timing notes

Surface the #1961 caveat from module and repo entrypoints.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: Chessing234

README.md

@@ -114,3 +114,7 @@ By committing your code to the [MIMIC Code Repository](https://github.com/mit-lc
 ### Coding style
 
 Please refer to the [style guide](https://github.com/MIT-LCP/mimic-code/blob/main/styleguide.md) for guidelines on formatting your code for the repository.
+
+### MIMIC-IV timing notes
+
+- [ICU chartevents timing](mimic-iv/docs/CHARTEVENTS_TIMING.md)

mimic-iv/README.md

@@ -105,4 +105,8 @@ mimic_utils convert_folder mimic-iv/concepts mimic-iv/concepts_duckdb --destinat
 
 # To PostgreSQL:
 mimic_utils convert_folder mimic-iv/concepts mimic-iv/concepts_postgres --destination_dialect postgres
-```
+```
+
+## Timing caveats
+
+`chartevents.charttime` can legitimately fall outside `icustays` windows — see [docs/CHARTEVENTS_TIMING.md](docs/CHARTEVENTS_TIMING.md).