Testing: Example compile gate (VM run + AOT -l for all examples/*.php)

[PurHur]

Problem

examples/001-SimpleWeb and 002-StaticWeb can drift from compiler capabilities. script/rebuild-examples.php benchmarks are optional; no CI fails when an example stops compiling.

Goal

CI step (host or Docker) that:

1. Runs each examples/*/example.php in VM (bin/vm.php -l or smoke output)
2. Runs bin/compile.php -l when LLVM is available (Testing: Run web AOT/JIT examples in CI when LLVM is present #181)

Tasks

• Add test/unit/ExamplesCompileTest.php or extend ExamplesReadmeTest
• Wire into script/ci-local.sh (skip AOT if no .llvm/)
• Update examples/README.md when AOT works (AOT: Re-enable examples/001-SimpleWeb in benchmark table with runtime GET #60)
• Include future 003-MiniWebApp (Reference app: examples/003-MiniWebApp (router, templates, forms) #67)

Acceptance criteria

Breaking htmlspecialchars in compiler fails CI before merge.

Dependencies

• Testing: Run web AOT/JIT examples in CI when LLVM is present #181 LLVM in CI
• CI: Run JIT compliance tests in CI (fix LLVM skip in PHPUnit) #98 JIT tests running

Files

• test/unit/, script/ci-local.sh