Stdlib: unlink() VM + LLVM JIT/AOT via libc unlink(2)

[PurHur]

Problem

Deploy and temp-file cleanup in compiled web apps need unlink():

@unlink($tmpPath);

Today only VM-adjacent file ops exist in patches; there is no unlink builtin in ext/standard/ with JIT/AOT lowering.

Goal

unlink(string $filename): bool with VM + JIT + AOT parity (libc unlink(2)), matching Zend semantics for missing files (false + warning).

Scope

• VM: ext/standard/unlink.php or lib/VM/Builtin/ delegate to VmFs::unlink / unlink()
• JIT: lib/JIT/Builtin/ → JitUnlink calling unlink(2)
• AOT: same LLVM intrinsic path as other VmFs libc wrappers
• Compliance: test/compliance/cases/standard/unlink.phpt
• Unit: test/unit/UnlinkBuiltinTest.php (success + missing file)

Implementation hints

Layer	Files	Notes
Register	ext/standard/ manifest, lib/JIT/Builtin/registry	Follow rename() / #771 pattern
VM	lib/VM.php builtin dispatch	Return bool
JIT	lib/JIT/Builtin/JitUnlink.php	char* path from PHP string
Capability	script/capability-matrix.php	Regenerate row

// Minimal compliance case:
$file = sys_get_temp_dir() . '/phpc_unlink_test_' . getmypid();
file_put_contents($file, 'x');
var_export(unlink($file));
var_export(unlink($file)); // false

Acceptance criteria

./script/ci-fast.sh --filter UnlinkBuiltin
./script/ci-local.sh --filter unlink.phpt   # @group llvm when JIT/AOT enabled

Docker:

docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  ./script/ci-fast.sh --filter UnlinkBuiltin

No GitHub Actions.

Dependencies

• Stdlib: rename() VM + LLVM JIT/AOT via libc rename(2) #771 rename() — same VmFs / libc family (can land in either order)
• AOT: phpc deploy bundles binary, public/, assets/, and phpc.json into dist/ #609 deploy dist — optional cleanup in examples (not required for close)

Links

• ROADMAP 🗺️ ROADMAP: Compile a small PHP web application (living document) #78 Phase 2 Stdlib
• Not related to MiniWebApp AOT link (AOT: MiniWebApp phpc build --project native link fails on master (post-#568/#734) #752) — do not confuse with closed Stdlib: unlink() VM + LLVM JIT/AOT via libc unlink(2) #748 PR title in old docs; this is stdlib unlink()