yaml.safe_load has no constructor for HA's `!include`/`!secret`/etc. tags
and raised ConstructorError on any real configuration.yaml. Add a
multi_constructor on `!` that generically wraps scalar/sequence/mapping
payloads in a TaggedValue, and a matching representer that re-emits the
same tag + payload — normalization stays idempotent across passes and key
sorting is unaffected by tagged values.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Structure only, no deploy path: DESIGN.md decision registry (phasing,
per-instance adapter, bidirectional sync with drift-abort on deploy,
reload-vs-restart gating, token handling), instances.yaml (ken/piha via
docker-exec, chelsty-ha via api), config/storage-export/fixtures dirs,
and a read-only scripts/ha/import.sh (docker-exec adapter only) with a
canonical YAML normalize+split library and an offline determinism test.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
