Replace phpdbg with php in coverage target

[ohmyfelix]

Summary

• replace -p phpdbg with -p php in the coverage target of Makefile
• align this repository with Remove phpdbg from coverage targets and use php instead contributte#73
• note local coverage verification is blocked in this environment because PHP has no Xdebug or PCOV extension loaded

Motivation

phpdbg is being removed from Contributte coverage targets. This switches the project to plain php so coverage can run through the standard PHP binary when a supported coverage driver is available.

Changes

• update the coverage target in Makefile to use php

Testing

• Tried make coverage
• Tests pass locally
• CI passes
• Manual verification

make coverage currently fails here with: Code coverage functionality requires Xdebug or PCOV extension or PHPDBG SAPI (used php).

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (master@2fbe98d). Learn more about missing BASE report.

Additional details and impacted files

@@            Coverage Diff            @@
##             master      #19   +/-   ##
=========================================
  Coverage          ?   55.55%           
=========================================
  Files             ?        3           
  Lines             ?        9           
  Branches          ?        0           
=========================================
  Hits              ?        5           
  Misses            ?        4           
  Partials          ?        0           

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