Stdlib: extract() and compact() for PHP template includes

[PurHur]

Problem

The reference MiniWebApp (#67, #246) and normal PHP micro-frameworks pass data into templates with:

$data = ['title' => 'Home', 'name' => $name];
extract($data);
include __DIR__ . '/../templates/home.php';

extract() / compact() are not in docs/capabilities.md or ext/standard/. Without them, templates either pollute scope manually or avoid include until much later.

Goal

VM + JIT support for:

• extract(array $vars, int $flags = EXTR_SKIP) — at minimum EXTR_SKIP on string keys
• compact(string ...$names) — build array from local variables (v1: literal name list only)

Scope

• VM wrappers in ext/standard/ (may delegate to PHP extract/compact initially)
• JIT callouts or native lowering for packed string-key arrays
• PHPT: template include after extract(['name' => 'Dev']) echoes variable
• Register in ext/standard/Module.php; update script/capability-matrix.php output
• Document blocker link from Reference: MiniWebApp lint-first skeleton (examples/003-MiniWebApp) #246 README table

Acceptance criteria

docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  ./phpc run -r '$t=["name"=>"Dev"]; extract($t); echo $name;'

prints Dev in VM; same after JIT path lands.

Dependencies

• Language: include/require in JIT and AOT (multi-file applications) #54 include in JIT/AOT (templates are useless without includes)
• Reference app: examples/003-MiniWebApp (router, templates, forms) #67 / Reference: MiniWebApp lint-first skeleton (examples/003-MiniWebApp) #246 reference app

Verification (local only)

make docker-build-22
docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  ./script/ci-local.sh --filter extract

Do not require GitHub Actions.

Related

• Stdlib: file_get_contents and readfile for templates/assets #62 file_get_contents (asset loading)
• Web: MiniWebApp routing pattern (front controller + path dispatch) #210 routing (handlers pass $data to templates)