M2 spine: src/ CLI bootstrap (cli.php + compat shims) (5 files)

[PurHur]

Summary

Entry shims used by bin/compile.php / bin/vm.php. May stay host-only until M4; track for inventory.

Units in this batch: 5

Files to add to spine / inventory

• src/cli.php
• src/llvm-env.php
• src/macro_functions.php
• src/tokenizer-compat.php
• src/yay-php8-compat.php

Gates (each PR)

script/apply-patches.sh
php bin/compile.php -l test/selfhost/compiler_lib_spine_smoke/main.php
BOOTSTRAP_LIB_SPINE_SMOKE=1 make bootstrap-selfhost-lib-spine-smoke
make bootstrap-aot-link
vendor/bin/phpunit test/unit/BootstrapSelfhostBundleTest.php

How to add units

1. require_once each file in test/selfhost/compiler_lib_spine_smoke/main.php
2. Confirm SelfHostBuiltinPolicy if stdlib JIT leaf
3. php script/bootstrap-selfhost-next-includes.php --bundle=test/selfhost/compiler_lib_spine_smoke/main.php
4. Update M2 count in docs/pages/development-status.md

Parent: #1056 · Umbrella: #.1419.

[PurHur]

Partial via #1457: all five src/* shims deferred — yay-php8-compat/macro_functions bracketed namespaces and cli.php vendor/argv side effects break AOT lint; documented in bundle comments until M4.