Add typed metadata support to RVM programs so that language frontends
can store language identity and arbitrary annotations alongside the
compiled bytecode.
Program metadata:
- Add `language` field to identify the source language (e.g. "rego",
"azure_policy") so the VM can adjust semantics at runtime
- Add `annotations` map (BTreeMap<String, MetadataValue>) for
frontend-specific key-value metadata
- Add MetadataValue enum with String, Bool, Integer, Float, Array,
and Object variants, plus full serde support
- Add to_value() conversion for runtime access from VM instructions
- Add has_host_await flag with recompute_host_await_presence()
Serialization:
- Bump binary format version from 5 to 6
- Add JSON serialization for the new metadata fields
Assembly listing:
- Display language and annotations in the program header
Compiler:
- Track has_host_await during Rego compilation
Anand Krishnamoorthi