chore(tests): drop the E_DEPRECATED suppression from the .phpt files — stable z-engine raises none

[lisachenko]

All 121 .phpt files carry a third --INI-- line:

error_reporting=E_ALL & ~E_DEPRECATED

It guards against a dependency deprecation being prepended to captured output (PHPUnit's .phpt runner forces display_errors=1, so one deprecation would fail every --EXPECT-- block). The offender was z-engine's development line declaring implicitly nullable parameters; the stable releases now required (~8.4.2 || ~8.5.0, #37) declare them ?Type.

Verified by forcing error_reporting=E_ALL over every test's own --INI-- block on PHP 8.4.19 with z-engine 8.4.2: 121/121 pass. The same check on PHP 8.5.9 / z-engine 8.5.0 should be repeated before the change lands.

Work: remove the line from all 121 files and update AGENTS.md/README.md wherever the three mandatory --INI-- lines are documented. Purely mechanical; no source change.

[lisachenko]

Correction to this issue as filed — the PHP 8.5 check it asked for has now been run, and it does not pass.

PHP	z-engine	error_reporting=E_ALL forced
8.4.19	8.4.2	121/121 pass
8.5.9	8.5.0	109/121 pass, 12 fail

The suppression is still load-bearing on PHP 8.5, but not for the reason it was written. z-engine raises nothing — this package does: SplObjectStorage::contains() in PreforkTaskDirectory is deprecated in 8.5, and the notice lands in the captured output of 12 tests. Filed separately as #39.

So the premise here ("stable z-engine raises none") is right and the conclusion ("therefore the line can go") is premature. Correct order: fix #39 first, then drop the line from all 121 files — at which point the suite starts catching this class of problem instead of hiding it, which is the actual argument for removing it.

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