fix: justfile shebang recipes indentation (spaces → tabs)

TODO.md

@@ -2,6 +2,8 @@
 
 ## Completed
 
+- [x] Fix `just serve` — justfile shebang recipes (`deploy-env`, `reencrypt-password`) used space indentation instead of tabs, causing "extra leading whitespace" parse error
+
 - [x] PDF 100 MB limit + bentopdf mention
   - [x] `ThesisCreateController`: `MAX_PDF_SIZE = 100 MB`; PDFs checked against it, other files still 500 MB
   - [x] `ThesisEditController`: same per-PDF limit applied