Testing: web_query_edge and web_superglobal_reread PHPT (#68 remainder)

[PurHur]

Problem

#68 lists web PHPT cases; several landed on master (web_redirect_302.phpt, web_request_merge.phpt, #634), but two edge cases are still missing:

• Malformed / duplicate query keys (web_query_edge.phpt)
• Re-reading $_GET after mutation in the same request (web_superglobal_reread.phpt)

Without them, parser regressions in lib/Web/Superglobals.php slip past ci-fast.sh.

Goal

Add PHPT fixtures under test/real/cases/ discovered by RealWorldTest (glob — no manual registry).

Implementation hints

PHPT	Env / script	Assert
web_query_edge.phpt	QUERY_STRING=a=1&a=2&=	Last-wins or Zend-documented behavior
web_superglobal_reread.phpt	Script mutates $_GET['x'] then reads again	Consistent VM hashtable

Copy --ENV-- structure from web_get.phpt. Runner: bin/vm.php (not host php).

Acceptance criteria

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

Dependencies

• Testing: Expand web PHPT suite (redirects, empty input, POST merge) #68 — parent checklist (close when both PHPTs green)
• Stdlib: http_response_code() for 404/500 and API status #252 — status codes (redirect case already covered elsewhere)

Verification

Local/Docker only — no GitHub Actions.

Links

• lib/Web/Superglobals.php, Testing: mini_web_app.phpt RealWorld fixture for 003-MiniWebApp routes #490 (MiniWebApp PHPT is separate)