php-in-php: getenv thin AOT via isThinStandaloneAotMain + libc kernel (#20156)

[PurHur]

Summary

• Drop StreamIoRuntime::shouldDeferHeavyStreamIoEmitters from StringGetenv / StringGetenvAll in favor of Context::isThinStandaloneAotMain() (php-in-php: delete JitHtmlspecialcharsKernel identity stub — always JitVmHelperLink + HtmlspecialcharsJitHelper PHP (#1492) #20141 / rename shape).
• Embed/non-thin: always JitVmHelperLink::ensureCompiled + JitNestedHelperCoerce value-box bridge for GetenvJitHelper.
• Thin/user-script AOT: keep JitGetenvKernel libc body — always-helper NestedJIT cannot see process environ (Epic: architecture rearrangement — TU-based pipeline, differential gates, generated maintenance (docs/architecture-review-2026-07.md) #16075; same pivot as php-in-php: delete JitHtmlspecialcharsKernel identity stub — always JitVmHelperLink + HtmlspecialcharsJitHelper PHP (#1492) #20141).
• Move getenv ensureStandaloneBodies outside standaloneInitPhase so NestedJIT is not forced during StreamIo init defer.
• Net −59 LOC in getenv bridges; regenerate inventory construct flags.

Closes #20156

Verification

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh
vendor/bin/phpunit test/unit/GetenvJitRuntimeShrinkTest.php
vendor/bin/phpunit test/unit/EnvLocalRuntimeShrinkTest.php
vendor/bin/phpunit test/unit/JIT/StringGetenvRuntimeStandaloneTest.php
vendor/bin/phpunit test/unit/JIT/StringGetenvAllRuntimeStandaloneTest.php
# AOT smoke (thin libc kernel):
./phpc build -o /tmp/getenv_s /tmp/getenv_smoke.php && /tmp/getenv_s   # path=ok
vendor/bin/phpunit --filter getenv test/aot/AotTest.php
# same 2 master-red fixtures: getenv_all, getenv_local_only (putenv overlay under thin)
make bootstrap-selfhost-vm-driver-execute-probe
php script/bootstrap-inventory.php --check   # OK 5504/5504
php script/check-selfhost-spine-coverage-sync.php
'

Lines removed: StreamIo defer gates + custom NestedJIT without JitVmHelperLink (~59 net LOC in StringGetenv/StringGetenvAll).

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