Remove phpdbg from coverage target

[ohmyfelix]

Summary

Replace phpdbg with php in the coverage Makefile target so Tracy follows the org-wide coverage runner change tracked in contributte/contributte#73.

Motivation

phpdbg is being removed from coverage targets across Contributte. Using plain php keeps this repository aligned with the new approach and avoids relying on the PHPDBG SAPI.

Changes

• switch the CI coverage command in Makefile from -p phpdbg to -p php
• switch the local HTML coverage command in Makefile from -p phpdbg to -p php

Testing

• Tests pass locally
• CI passes
• Manual verification (if applicable)
• attempted make coverage
• local verification is blocked because this environment uses php without Xdebug or PCOV, so Nette Tester reports that code coverage requires Xdebug, PCOV, or PHPDBG

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@e2ba756). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #33   +/-   ##
=========================================
  Coverage          ?   46.66%           
=========================================
  Files             ?        5           
  Lines             ?       45           
  Branches          ?        0           
=========================================
  Hits              ?       21           
  Misses            ?       24           
  Partials          ?        0           

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