CI: fail ci-local.sh when LLVM present but JIT compliance 100% skipped

[PurHur]

Summary

• After the @group llvm PHPUnit stage, script/ci-local.sh writes JUnit XML and runs script/check-jit-compliance-ran.php.
• CI exits non-zero when libLLVM-9.so.1 exists but all JITTest cases were skipped (PHPUnit still reports exit 0 for “OK, but incomplete”).
• Documents PHP_COMPILER_ALLOW_JIT_SKIP=1 override in README.
• Refreshes docs/bootstrap-inventory.md (stale vs current tree; required for bootstrap-inventory.php --check in Docker CI).

Closes #250. Related: #98 (root JIT loader fix), #245 (CI matrix doc).

Test plan

• Healthy Docker (php-compiler:22.04-dev): check-jit-compliance-ran.php reports “167 of 167 JIT tests executed”.
• Broken LD_LIBRARY_PATH=/nonexistent: guard exits 1 with actionable message; PHPUnit exit 0 with 167 skipped.
• PHP_COMPILER_ALLOW_JIT_SKIP=1 skips the guard (documented).
• ./script/docker-ci-local.sh bootstrap + llvm guard path exercised via tar fallback (harness bind-mount empty).

make docker-build-22
docker run --rm -v "$(pwd):/compiler" -w /compiler php-compiler:22.04-dev ./script/ci-local.sh
# or: ./script/docker-ci-local.sh

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