php-in-php: lazy stdlib string/file helpers from Type::String_::implement (#35613)

[PurHur]

Summary

Continues the #32122 / .1 mint class runtime-shrink ladder (peer #35609): drop 21 eager ::implement() calls from Type\String_::implement() for stdlib string/file helpers whose ext/ and Jit* call sites already ensureLinked before lookup.

Removed from full Type init NestedJIT:

• htmlspecialchars/decode, preg_quote, add/stripslashes, urlencode/decode, nl2br, ucwords
• random_bytes, serialize/unserialize, http_build_query, parse_str
• deploy path, readfile, file_get/get/put contents, mime_content_type, meta tags, get_browser

Left eager: StringBitwiseNot (Helper emits inline — needs call-site ensureLinked first, #35301), IniSet/IniGet/ErrorReporting (JitIni get/set + JitErrorReporting still lookup without ensureLinked, #34848), date/time batch (peer #34241).

No new runtime/*.c — RUNTIME_C_SOURCES stays empty.

Root cause

Eager NestedJIT during Type\String_::implement() on the full JIT load path mints duplicate ABI symbols (*.1) when Runtime and Context both link the same helper (#31894 / #32122).

Test plan

./script/phpunit.sh --filter TypeStringImplementLazyStdlibRuntimeShrinkTest
# OK (3 tests, 76 assertions)

./script/aot-smoke.sh
# aot-smoke: 8 passed, 0 failed

./script/docker-exec.sh -- bash -lc './script/cold-build-check.sh'
# cold-build-check: ok — clean-checkout compile of hello world took 3s (budget 120s)

Not run: full ci-fast.sh, differential sweep, north-star5-verify-fast (compile-spine stub audit already 0/0 stubbed; change is lazy-link only on full Type init path).

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