[path] Complete runtime-aware binary fallbacks for remaining commands (#297)

[coisa]

Related Issue

Closes #297

Motivation / Context

• Global fast-forward/dev-tools installs still failed in the remaining command flows that hardcoded vendor/bin/phpdoc, vendor/bin/phpunit, or vendor/bin/phpmetrics.
• Consumer repositories that do not install those binaries locally should still be able to use the active DevTools runtime fallback.

Changes

• Route DocsCommand, WikiCommand, TestsCommand, and MetricsCommand through DevToolsPathResolver::getPreferredToolBinaryPath(...).
• Keep process command arrays explicit so runtime binary paths are not split on spaces.
• Extend command and path resolver coverage for the remaining phpdoc, phpunit, and phpmetrics flows.
• Add a CHANGELOG.md entry for the automation-facing fix.

Verification

• composer dev-tools
• Focused command(s): composer dev-tools tests -- --filter='(DocsCommandTest|WikiCommandTest|MetricsCommandTest|TestsCommandTest|DevToolsPathResolverTest)'
• Manual verification: not run separately; covered by the command and resolver test coverage added here.

Documentation / Generated Output

• README updated
• docs/ updated
• Generated or synchronized output reviewed

Changelog

• Added a notable CHANGELOG.md entry

Reviewer Notes

• This completes the runtime-aware binary fallback follow-up from #292 for the remaining phpDocumentor, PHPUnit, and PhpMetrics command paths.

[github-actions]

🚀 Preview is available for this pull request.

• Docs: https://php-fast-forward.github.io/dev-tools/previews/pr-298/
• Coverage: https://php-fast-forward.github.io/dev-tools/previews/pr-298/coverage/
• Metrics: https://php-fast-forward.github.io/dev-tools/previews/pr-298/metrics/

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