VM: CLI opcache file cache for bin/vm.php bootstrap (#36206)

[PurHur]

Summary

Partial #36206 step 1 — enable Zend OPcache for CLI invocations:

• script/php-env.sh: default-on opcache.enable_cli=1 + git-SHA-keyed build/opcache-<sha>/ file cache (validate_timestamps=0). Opt out: PHP_COMPILER_OPCACHE_CLI=0.
• test/BaseTest.php: compliance VM subprocesses get the same flags via phpCommand() so VMTest shards benefit without manual -d flags.
• .gitignore: build/opcache-*

Lazy builtin registration / harness --batch mode remain follow-up.

Verify

./script/phpunit.sh --filter VmOpcacheCli36206Test
# OK (3 tests, 9 assertions)

make dev-verify-fast
# OK (72s): aot-smoke 9/9 + size gate, VM differential tier-0 15/15

./script/docker-exec.sh -- bash -lc 'source script/php-env.sh && echo "${PHP_OPTS[*]}" | tr " " "\n" | grep opcache'
# opcache.enable_cli=1
# opcache.file_cache=/compiler/build/opcache-7aab510f78ca
# opcache.validate_timestamps=0

Not run: full serial VMTest, 24-shard compliance baseline diff, north-star5-verify-fast.

Closes #36206 (step 1 only — hello ≤0.25s target needs lazy builtin registration follow-up).

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