Stdlib: stream_context_set_option incomplete string form → ValueError (#30645)

[PurHur]

Summary

• Match php-src ext/standard/streamsfuncs.c PHP_FUNCTION(stream_context_set_option) overload guards: 2-arg string form and 3-arg string form throw Zend ValueError instead of LogicException / silent true.
• VM VmStreamContext::setOption no longer synthesizes a null $value for omitted arg Stdlib: round, sqrt, gettype and expanded PHPT specs #4; JIT/AOT lowering uses the same messages via ExceptionBridge::emitValueErrorAndAbort.
• PHP implementation: ext/standard/VmStreamContext.php, ext/standard/stream_context_set_option.php, ext/standard/JitStreamContextSetOption.php. No new C.

Closes #30645

php-src reference

• php/php-src ext/standard/streamsfuncs.c — Z_PARAM_ARRAY_HT_OR_STR + zend_argument_value_error(3/4, …)

Test plan

• VM repro matches Zend 8.2.32
• JIT repro matches Zend
• PHPUnit: StreamContextSetOptionIncomplete30645VMTest, StreamContextSetOptionIncomplete30645JITTest, Issue30645StreamContextSetOptionIncompleteTest, AOT @group llvm
• Related stream_context_set_option* suite (29 tests)

Verification

php test/repro/maintainer_gap_stream_context_set_option_incomplete.php
php bin/vm.php test/repro/maintainer_gap_stream_context_set_option_incomplete.php
./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && php bin/jit.php test/repro/maintainer_gap_stream_context_set_option_incomplete.php'
./script/phpunit.sh --filter 'StreamContextSetOptionIncomplete30645VMTest|Issue30645StreamContextSetOptionIncompleteTest|StreamContextSetOptionBuiltinTest'
./script/phpunit.sh --filter 'StreamContextSetOptionIncomplete30645JITTest|Issue30645StreamContextSetOptionIncompleteAotTest'
./script/phpunit.sh --filter 'StreamContextSetOption|Issue27295|Issue28344|Issue28680StreamContext'

Zend + VM + JIT output (all identical):

ValueError: stream_context_set_option(): Argument #3 ($option_name) cannot be null when argument #2 ($wrapper_or_options) is a string
ValueError: stream_context_set_option(): Argument #4 ($value) must be provided when argument #2 ($wrapper_or_options) is a string
true
true

PHPUnit: OK (3 tests) VM; OK (4 tests) JIT/AOT; OK (29 tests) related stream-context suite.

./script/ci-fast.sh: AOT smoke OK; failed on check-rebuild-examples-009-sync (examples/README.md 009-FastCGIWeb AOT columns) — this tree did not touch examples/; same README as master.

Not covered

• Full VMTest / JITTest compliance suites
• north-star5-verify --strict
• Differential sweep (no operand/CFG shape change beyond builtin argc/ValueError guards)

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