fix(cli): include plugins info in shell completions

[Ayush7614]

Summary

• Add info to the plugins / plugin shell-completion tree
• Cover it in completion-tree tests

zero plugins info landed in #773, but zero completions still omitted it.

Closes #791

Test plan

• go test ./internal/cli/ -run 'Completions|CompletionTree' -count=1
• go vet ./internal/cli/

Summary by CodeRabbit

• Bug Fixes
  • Added shell completion support for the plugins info command.
  • Updated completions for both plugin and plugins command paths to include all available subcommands and aliases.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: 845d3a2d-95e5-4803-8c58-c6c7f7c17232

📥 Commits

Reviewing files that changed from the base of the PR and between d9b882e and 3cdf800.

📒 Files selected for processing (2)

• internal/cli/completions.go
• internal/cli/completions_test.go

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Walkthrough

The plugin shell completion tree now exposes info alongside existing plugin subcommands, with coverage for both plugins and plugin command paths.

Changes

Plugin shell completions

Layer / File(s)	Summary
Add info completion and assertions internal/cli/completions.go, internal/cli/completions_test.go	The plugins completion node includes info, and tests verify expected candidates for both plugins and plugin paths.

Estimated code review effort: 2 (Simple) | ~5 minutes

Possibly related PRs

• Gitlawb/zero#764: Established the completion command-tree generator and coverage assertions extended by this change.
• Gitlawb/zero#773: Added the zero plugins info CLI command represented in shell completions.

Suggested reviewers: anandh8x, kevincodex1

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly states the main change: adding plugins info to shell completions.
Linked Issues check	✅ Passed	The change adds info to the plugins completion tree and covers it in tests, matching #791.
Out of Scope Changes check	✅ Passed	No unrelated code paths or extra features appear in the reported changes.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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_{Comment @coderabbitai help to get the list of available commands.}

[kevincodex1]

lgtm