Self-host M5: gen-0 prefers compiled driver + docker-exec sync (#2894)

[PurHur]

Summary

Closes #2894.

• Document and enforce gen-0 native driver resolution order in bootstrap-resolve-compile-invoke.sh (inventory → bin-compile-aot → emit-helper → helloworld → selfhost-compile-driver).
• Log (gen-0 compiled) vs (gen-0 Zend) explicitly; add BOOTSTRAP_ALLOW_GEN0_ZEND and BOOTSTRAP_USE_INVENTORY_DRIVER.
• Extend docker-exec.sh tar-fallback sync-back for bootstrap-selfhost-link and build/bin-compile-aot-inventory (+ M3 sidecar blobs) so a second harness invocation reuses host drivers without Zend.
• Align bootstrapVendorPrelinkResolveCompileInvoker() with the same native order.

php-src / harness reference

Bootstrap gen-0 path mirrors committed prelinked/bootstrap-gen0/ seed (not Zend php bin/compile.php) per M5 ladder in docs/bootstrap-generations.md.

Verification

rm -rf build/
./script/docker-exec.sh -- bash -lc 'make bootstrap-selfhost-link' 2>&1 | grep bootstrap-compile-invoke
# → (gen-0 compiled) via prelinked seed

./script/docker-exec.sh -- bash -lc 'make bootstrap-selfhost-link' 2>&1 | grep bootstrap-compile-invoke
# → (gen-0 compiled) reusing host build/bin-compile-aot (no bootstrap-gen0-install)

./script/docker-exec.sh -- vendor/bin/phpunit test/unit/BootstrapSelfhostLinkTest.php

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