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

[lisachenko]

All 19 .phpt files carry a third --INI-- line:

error_reporting=E_ALL & ~E_DEPRECATED

It was added because z-engine's development line declared implicitly nullable parameters (ZEngine\Type\OpLine::__construct()), and PHPUnit's .phpt runner forces display_errors=1, so the deprecation was prepended to the captured output of every test and each --EXPECT-- block failed on noise from a dependency.

The stable releases now required (~8.4.2 || ~8.5.0, #20) declare those parameters ?Type — verified in the installed source — so the suppression no longer suppresses anything.

Verified by forcing error_reporting=E_ALL over every test's own --INI-- block:

PHP	z-engine	Result
8.4.19	8.4.2	19/19 pass
8.5.9	8.5.0	19/19 pass

Work: remove the line from all 19 files, update the --INI-- rules in CLAUDE.md (which currently describes three mandatory lines) and the anatomy example. Purely mechanical; no source change.