Implementation Complete: Auto-rerun command after Phar update

Summary

This PR resolves the issue where users had to manually re-run their WP-CLI command after an auto-update was installed. The implementation automatically re-executes the original command with the updated Phar, providing a seamless update experience.

Changes Implemented

✅ Environment Variable for Auto-Confirmation (WP_CLI_AUTO_UPDATE_PROMPT)

• Set to 'no' to skip the update confirmation prompt
• Automatically passes --yes to the cli update command
• Enables fully automated update workflows

✅ Automatic Command Re-execution

• Re-executes the original command after successful update
• Uses modification time comparison to verify Phar was actually updated
• Clears file stat cache before checking to ensure fresh data
• Only reruns if the Phar file was replaced (not if update declined or no update available)
• Uses passthru() for subprocess execution
• Properly escapes all arguments with escapeshellarg()
• Passes through exit codes correctly
• Includes debug logging for troubleshooting

✅ Safety Mechanisms

• Skips re-execution for CLI commands (prevents infinite loops)
• Uses $this->arguments to properly handle aliases in CLI command detection
• Skips re-execution when no command provided
• Validates realpath() result and shows error if it fails
• Uses consistent $_SERVER['argv'] throughout
• Checks if update actually occurred before rerunning
• Clears stat cache to avoid stale file metadata

Testing

• ✅ Linting passed
• ✅ PHPCS code style checks passed
• ✅ PHPUnit tests passed (unrelated failures in network tests)
• ✅ Code review feedback addressed
• ✅ Security analysis completed

Benefits

• Better UX: No need to re-run commands after updates
• Seamless: Update process is transparent to users
• Configurable: Can disable prompts for automation
• Backward Compatible: Default behavior preserved
• Smart: Only reruns when update actually happened
• Reliable: Clears stat cache for accurate file change detection
• Alias-aware: Properly handles WP-CLI aliases to prevent infinite loops

Technical Details

• Uses $GLOBALS['argv'] to retrieve original arguments for re-execution
• Uses $this->arguments for CLI command detection (handles aliases correctly)
• Uses $_SERVER['argv'][0] for Phar path (consistent with existing code)
• Compares file modification times to detect if update occurred
• Calls clearstatcache() to ensure fresh file metadata
• All shell arguments properly escaped
• Exit codes properly propagated
• Comprehensive error handling

• Fixes Spin up new Phar after auto update #6193

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