Web: JIT/AOT mode for bin/serve.php (compile per script on first request)

[PurHur]

Problem

bin/serve.php always uses VM (Runtime → lib/VM.php). Dev servers for Zend PHP often use OPcache; we have JIT (#153 cache) but no serve integration.

Goal

phpc serve --jit 127.0.0.1:8080 examples/001-SimpleWeb

Compiles .php scripts with bin/jit.php on first hit, caches (#153), falls back to VM on compile error.

Tasks

• Flag on bin/serve.php / phpc serve --jit
• Per-script compile cache directory
• Warm superglobals per request (Web: Runtime-populated superglobals for JIT and AOT (per-request $_GET/$_POST) #49) before JIT entry
• Document performance vs VM
• Test behind Testing: bin/serve.php HTTP integration tests (curl PHPT) #151 serve integration tests

Acceptance criteria

Second request to same script is faster than first; output matches VM.

Dependencies

• Web: Runtime-populated superglobals for JIT and AOT (per-request $_GET/$_POST) #49 runtime superglobals
• JIT: On-disk compile cache for warm requests #153 on-disk JIT cache
• CI: Run JIT compliance tests in CI (fix LLVM skip in PHPUnit) #98 JIT tests green

Files

• bin/serve.php, bin/phpc.php, lib/Runtime.php