Repurpose --quiet flag to suppress automatic REPL output

[Copilot]

Implementation Plan: Suppress Shell Output with --quiet Flag

• Understand the codebase and existing shell implementation
• Modify Shell_Command to pass quiet flag to REPL
• Update REPL class to suppress automatic output when quiet mode is enabled
• Add documentation for the --quiet flag
• Create tests for quiet mode functionality
• Run tests to validate the implementation
• Address code review feedback (cast quiet flag to boolean)
• Fix Boris REPL compatibility - only pass quiet to built-in REPL
• Fix output buffering logic to properly capture output
• Review and finalize changes

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Option to suppress output?</issue_title>
<issue_description>## Feature Request

• Yes, I reviewed the contribution guidelines.

When dealing with complex queries, WP Shell often dumps large volumes of data on to my screen.

For example, running a query with 'posts_per_page'=> 200, will result in hundreds of blog posts being printed. But I only want, say, the GUID.

Describe the solution you'd like

I'd like a command-line option so that wp shell --no-output will only display what I explicitly echo.

Current version:

wp shell
wp> $a = "hello";
=> string(5) "hello"

Proposed version:

wp shell --no-output
wp> $a = "hello";
wp></issue_description>

Comments on the Issue (you are @copilot in this section)

@danielbachhuber We could potentially repurpose the `--quiet` global argument for this.

Feel free to submit a pull request, if you'd like. Here is some guidance on our pull request best practices.</comment_new>
<comment_new>@danielbachhuber
@edent That might be it!</comment_new>

• Fixes Option to suppress output? #65

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[edent]

@copilot please stop spamming me

[swissspidy]

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[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Shell_Command.php	60.00%	2 Missing ⚠️

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