php-in-php: gate JitEnv putenv thin AOT on isThinStandaloneAotMain (#20499)

[PurHur]

Summary

• Drop StreamIoRuntime::shouldDeferHeavyStreamIoEmitters from ext/standard/JitEnv.php putenv paths; gate libc-only thin AOT on Context::isThinStandaloneAotMain() (peer php-in-php: drop shouldDeferHeavyStreamIoEmitters from ObOutputJitBridge — thin via isThinStandaloneAotMain (#1492) #20443 / php-in-php: delete JitGetenvKernel libc defer — always JitVmHelperLink + GetenvJitHelper PHP (#1492) #20156).
• Inventory / M3 / standaloneInitPhase can now NestedJIT GetenvJitHelper::putenv when not thin-standalone; thin user-script AOT keeps libc-only (AOT: fix request_parse_body compile/link (#5965) #17316).
• Add test/unit/PutenvRuntimeShrinkTest.php shrink guard.

Closes #20499

Lines removed / shrunk

• ext/standard/JitEnv.php: removed use StreamIoRuntime + 2 shouldDeferHeavyStreamIoEmitters() call sites (replaced with isThinStandaloneAotMain()).
• No new C runtime; PHP defer-gate shrink only.

php-src reference

• ext/standard/basic_functions.c — zif_putenv / zif_getenv

Test plan

• vendor/bin/phpunit test/unit/PutenvRuntimeShrinkTest.php — OK (2 tests)
• vendor/bin/phpunit test/unit/GetenvJitRuntimeShrinkTest.php — OK
• vendor/bin/phpunit test/unit/EnvLocalRuntimeShrinkTest.php — OK
• make bootstrap-selfhost-vm-driver-execute-probe — OK

Verification transcript

OK (2 tests, 8 assertions)   # PutenvRuntimeShrinkTest
OK (3 tests, 22 assertions)  # GetenvJitRuntimeShrinkTest
OK (6 tests, 38 assertions)  # EnvLocalRuntimeShrinkTest
bootstrap-selfhost-vm-driver-execute-probe: OK /compiler/build/selfhost-lib-spine-smoke

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