Zsh completion

[creativeprojects]

Add native support for zsh completion (no need to use the translation script from bash completion)
Add integration tests for bash 4+, zsh and fish

Fixes #361 #403

[codecov]

Codecov Report

❌ Patch coverage is 50.00000% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.96%. Comparing base (67b37a9) to head (3ea571f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
commands.go	50.00%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #653      +/-   ##
==========================================
- Coverage   80.99%   80.96%   -0.03%     
==========================================
  Files         162      162              
  Lines       12113    12122       +9     
==========================================
+ Hits         9810     9814       +4     
- Misses       1806     1810       +4     
- Partials      497      498       +1     

Flag	Coverage Δ
unittests	79.24% <50.00%> (-0.03%)	⬇️

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[Copilot]

Pull request overview

Adds native zsh completion support to resticprofile and introduces integration testing to validate shell completion behavior across bash, zsh, and fish (including restic delegation), with a dedicated CI workflow to run these tests.

Changes:

• Replace the old zsh “bashcompinit translation” script with a native zsh completion implementation.
• Add shell completion integration tests (bash 4+, zsh, fish) and a make test-completion target, plus a CI workflow to run them.
• Update installation docs to reflect the new zsh completion loading/install paths.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
Makefile	Adds test-completion target to run shell completion integration tests.
docs/content/installation/shell.md	Updates zsh completion loading/install instructions for the native script.
contrib/completion/zsh-completion.zsh	Adds a native zsh completion script (incl. restic delegation handling).
contrib/completion/zsh-completion.sh	Removes the legacy zsh script that relied on translating bash completion.
completion_shell_test.go	Adds integration tests that exercise generated completion scripts in real shells.
commands.go	Enables zsh completion requester support and adds optional debug logging for completion inputs/outputs.
commands_test.go	Updates unit tests to assert zsh completion requester returns expected completions.
commands_generate.go	Switches embedded zsh completion asset to the new .zsh script.
.github/workflows/completion.yml	Adds CI workflow to install shells/restic and run make test-completion.

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