Add host build cache fingerprint restore

[yoshifuminakamura]

Summary

• add host build-environment fingerprints for common make/cmake/ninja wrapper builds
• allow late host cache restore after module-loaded build environments are captured
• include build tool binary SHA-256 values in environment snapshots and cover host wrapper cache hits in tests

Safety

• no generated YAML or app-side build hook files added
• diff scan found no token/secret-like values

Tests

• bash scripts/tests/test_build_cache.sh
• bash scripts/tests/test_build_environment_snapshot.sh
• shellcheck -S error scripts/build_with_cache.sh scripts/build_tool_wrappers/bk_build_tool_wrapper.sh scripts/collect_environment_snapshot.sh scripts/tests/test_build_cache.sh
• bash -n scripts/build_with_cache.sh scripts/build_tool_wrappers/bk_build_tool_wrapper.sh scripts/collect_environment_snapshot.sh scripts/tests/test_build_cache.sh
• /home/nakamura/fugakunext/venv/bin/python -m pytest result_server/tests/test_environment_snapshot_ci_scripts.py