Env is the declared container environment, as the chart's list of {name,value}. It is read back so a re-declare of an identical body is a no-op rather than a refusal — idempotency is what makes a retry safe.
Project is the AppProject the sync is admitted under, derived from the directory exactly as the ApplicationSet derives it. It differs from Org for a reserved directory, which syncs under the platform fence.
Please note: This property should have been non-nullable! Since the specification file
does not include a default value (using the "default:" property), however, the generated
source code must fall back to having a nullable type.
Consider adding a "default:" property in the specification file to hide this note.