Fix completions to obey customized profile directories

[Speedy1894]

Instead of only the old directories, /usr/lib/tuned/profiles,/etc/tuned/profiles, use the profile_dir option in the configuration file (the default being the old constant value) or /usr/lib/tuned,/etc/tuned if on a version of tuned that doesn't support it.

Fixes #881

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 3ff30a84-0820-4f5f-9fd0-73f1641e1f86

📥 Commits

Reviewing files that changed from the base of the PR and between a4907c9 and 38243d1.

📒 Files selected for processing (5)

• Makefile
• tuned-adm.bash
• tuned-adm.zsh
• tuned.spec
• tuned.zsh

Included review availability: Your plan provides up to 4 included reviews per hour; 3 remain after this review.

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📝 Walkthrough

Summary by CodeRabbit

• New Features
  • Added Zsh tab-completion support for tuned and tuned-adm.
  • Completions include available profiles, commands, options, and log levels.
  • Profile suggestions adapt to the installed Tuned version and configured profile locations.
• Installation
  • Zsh completion files are now included in release packages and installed automatically in the system completion directory.

Walkthrough

Adds Zsh completion support for tuned and tuned-adm. Completion discovers profiles from Tuned versions and optional configuration. Build and package installation now include the Zsh completion scripts.

Changes

Zsh completion support

Layer / File(s)	Summary
Profile discovery across shells tuned-adm.bash, tuned-adm.zsh, tuned.zsh	Completion helpers select profile directories based on the Tuned version and optional profile_dirs configuration. Bash profile completion uses the shared helper.
Zsh command completion tuned-adm.zsh, tuned.zsh	Zsh definitions add global options, subcommands, argument specifications, log-level values, and dynamic profile completion.
Archive and package installation Makefile, tuned.spec	Release archives and the main package include both Zsh completion files. Installation places them in the system Zsh completion directory.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 38243

The completion changes introduce no actionable merge-blocking risk based on the available evidence and are merge-ready after normal checks and review.

Suggested reviewers: yarda

Sequence Diagram(s)

sequenceDiagram
  participant Developer
  participant Zsh
  participant TunedConfig
  participant ProfileDirectories
  Developer->>Zsh: request tuned completion
  Zsh->>TunedConfig: read profile_dirs when supported
  Zsh->>ProfileDirectories: list available profiles
  ProfileDirectories-->>Zsh: return profile names
  Zsh-->>Developer: show command and profile completions

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🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 4 functions across 3 files. (2 skipped: 2 unsupported.)	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly describes the primary change to make completion profile discovery respect customized profile directories.
Description check	✅ Passed	The description explains the profile directory fallback behavior and links the change to issue #881.

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[Speedy1894]

(The completion-adding commit is here because that branch is a parent of this one — sorry if I should've put the second commit on top of it)