hermes plugins install <repo>#gateway-plugin ships ONLY the gateway-plugin/ subdirectory into ~/.hermes/plugins/iris, so the repo-root VERSION file is not present there and plugin_version() fell back to 'unknown' — the app then showed a false 'App and gateway versions differ' warning. - version.py: resolution chain repo-root VERSION (dev/symlink install) -> plugin.yaml version field (production install) -> 'unknown'; stdlib-only parse, base= param for tests - plugin.yaml: bump stale version 0.1.0 -> 0.1.2 (matches VERSION) - scripts/check_version_sync.sh + pre-commit hook: fail commits where plugin.yaml drifts from the repo-root VERSION - tests: regression test simulating the production layout