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+++ b/TODO.md
@@ -24,6 +24,16 @@ bash completion).
 - [ ] Consider a `--no-color` flag (color is currently TTY-auto only).
 
 ## Infrastructure
+- [ ] n-level command nesting. `cli.py` `_build_parser` and
+      `scripts/gen_completion.py` both `partition(" ")` on the command name, so
+      they only nest two levels (group + leaf). `budget limit-set` /
+      `budget limit-list` are flattened to a hyphenated 2-token leaf as a
+      workaround (v0.4.0). Refactor both to split the full name into tokens and
+      build/scan nested subparsers per token, then a genuine `budget limit set`
+      (three tokens) works and future groups needing sub-subcommands are a
+      non-issue. Add a CLI-dispatch test (parse_args on the real parser), since
+      the mocked unit suite calls handlers directly and cannot catch a
+      dispatch/nesting break.
 - [ ] `--raw` escape hatch for arbitrary API calls.
 - [ ] OAuth as an alternative to personal access tokens.
 - [ ] zsh / fish completion (bash done).