Removal resolves the drive from the app's own app.yaml HDD_PATH (the 07 ~L437
rule), never the global cfg.Paths.HDDPath which no box sets. A data removal
that cannot be resolved, or whose drive is absent, is refused with a typed
RemoveRefusedError -> 409 + exact Hungarian sentence, before compose down, and
the app is kept. SSD app -> hdd_paths_removed: [] never null; missing folders
stated; backup-path refusals reach the response.
15 tests, two red-proofs run (pre-fix fallback -> C fails with err=nil and the
handler 200s; "no drive refuses" -> D fails).
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS
