Merge commit '44718e8a' into feat/8jk6.3-date-hierarchy

# Conflicts:
#	crates/improvise-io/src/import/wizard.rs
#	tests/headless_cli.rs

README.md

@@ -178,7 +178,14 @@ opening one fails with an error that says so. JSON *import* is unaffected.
 The import wizard analyzes CSV columns and proposes each as a category
 (string-valued), measure (numeric), time dimension (date-like, with optional
 year/month/quarter extraction), or skip. Multiple CSVs merge automatically
-with a synthetic "File" category.
+with a synthetic "File" category, even when their headers differ. A record
+simply has no value for a column its file lacks. A folder argument imports
+every `*.csv` in it, in name order, even when it holds a single CSV. Each file
+also gets its own view, filtered to that file and showing only its columns:
+
+```sh
+improvise import reports/ --no-wizard -o reports.improv
+```
 
 All model mutations go through a typed command registry, so the same
 operations that back the TUI work headless: