[thedavidmeister]

After merge, @rainlanguage/subgraph-meta exports every known magic by its Rust name and gives each decoded item its OA schema, so st0x.deploy, rain.deploy and the OA subgraph can drop their local copies. Refs #328.

Live effect: none until a consumer bumps the package · Risk: low (no money path; decode accepts and rejects the same input) · Ships: next package publish

Decisions

• The schema is raw Bytes, and schemaString() applies the preimageString rule, not graph-node's toString(), because that conversion is lossy and strips NUL.
• The magics check reads each export's name, value and type from the compiled runner, not from a hand-kept list. An extra, missing, renamed, wrong-valued or non-u64 export fails the diff against magic.rs.

Proof

• The parity job compares each item's schema bytes and string with cbor_decode. It covers corpus cases for absent, empty, NUL and invalid UTF-8 schemas, plus 100000 fuzz documents.
• Mutation on 376fe34 covered the named magics, KNOWN_MAGICS, the schema plumbing and schemaString(): 121 of 123 mutants were killed. A magic retyped i64 survived, and the u64 check now kills it. The other survivor is equivalent: an extra fail() after a read that already failed.
• Not verified: no consumer has built against this package yet. CI runs the decoder under node, not inside graph-node.

🤖 Generated with Claude Code

[linear]

RAI-4253