DevEx: MINIWEBAPP_VM_CLI_GATE runs MiniWebApp VM CLI tests in ci-fast

[PurHur]

Problem

#586 / #590 will add fast PHPUnit gates for MiniWebApp routes without TCP. Today script/ci-fast.sh does not document or enforce running them by default — contributors may land PATH_INFO regressions while full ci-local.sh is expensive.

#570 added PhpcLintProjectTest to ci-fast; VM route matrix should be the next progressive gate.

Goal

1. After Testing: MiniWebApp VM CLI route matrix (phpc run, no TCP) #586/Stdlib: strspn() and strcspn() (VM + LLVM JIT/AOT) #590 land, register tests in phpunit.xml.dist (no @group llvm).
2. script/ci-fast.sh runs MiniWebApp VM CLI filters when MINIWEBAPP_VM_CLI_GATE=1 (default on once green, or always-on after flip).
3. script/miniwebapp-gates.sh prints stage for VM CLI gate.
4. Document env in examples/003-MiniWebApp/README.md and DevEx: MiniWebApp CI gate ladder (lint → serve → AOT → web-smoke) #472 ladder.

Acceptance criteria

MINIWEBAPP_VM_CLI_GATE=1 ./script/ci-fast.sh

Docker:

docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev \
  MINIWEBAPP_VM_CLI_GATE=1 ./script/ci-fast.sh --filter 'MiniWebApp.*VmCli'

Dependencies

• Testing: MiniWebApp VM CLI route matrix (phpc run, no TCP) #586, Stdlib: strspn() and strcspn() (VM + LLVM JIT/AOT) #590 test implementations
• Reference app: MiniWebApp runtime green (lint 0, VM serve, routes) #539 VM green
• Complements Testing: Run PhpcLintProjectTest MiniWebApp gate in ci-fast #570 lint gate

Links

• #472, #503
• ROADMAP #78