add description to zsh completion

[creativeprojects]

No description provided.

[Copilot]

Pull request overview

This PR extends resticprofile complete to optionally include tab-separated descriptions for zsh (via a new zsh:v2 protocol version) and updates the bundled zsh completion script to display those descriptions in completion listings.

Changes:

• Add zsh:v2 support to include descriptions in completion output (gated by requester version).
• Update the zsh completion script to request zsh:v2 and attempt to show descriptions.
• Extend completion tests to cover zsh:v2 returning descriptions.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
contrib/completion/zsh-completion.zsh	Adds a helper to render tab-separated descriptions and switches the protocol to zsh:v2.
commands.go	Enables descriptions for zsh:v2 (and keeps zsh:v1 behavior unchanged).
commands_test.go	Adds a test case asserting zsh:v2 includes descriptions.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 80.96%. Comparing base (b3a589e) to head (05c65ba).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #656   +/-   ##
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  Coverage   80.96%   80.96%           
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  Files         162      162           
  Lines       12122    12122           
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  Hits         9814     9814           
  Misses       1810     1810           
  Partials      498      498           

Flag	Coverage Δ
unittests	79.24% <100.00%> (ø)

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