v0.1.4 — a genuinely useful help page

dnz -h now actually helps:

• Examples section covering the common flows — archiving a folder, mixing files and directories, --progress, --no-cm, extract/verify/list, and dnz update.
• Recursion is explicit: dnz a documents that directories are added recursively.
• Visible aliases: the command list shows a [aliases: add] and x [aliases: extract].
• Every argument is documented, and the one-line about states the tool's philosophy: smallest possible output, speed deliberately sacrificed.
• dnz a archive.dnz with nothing to add is now a proper usage error at parse time.

No format or compression changes — archives are fully compatible.

Update with dnz update (v0.1.1+) or by re-running the install one-liner.