Add OffchainAsset (OA) magic numbers to KnownMagic enum

[thedavidmeister]

What

Adds the five OffchainAsset (OA) magic numbers used by the gildlab/SFT frontend and the h20.market tokenization UI to the KnownMagic enum in crates/cli/src/meta/magic.rs, so RainMetaDocumentV1Item can be used to encode/decode receipt information for OffchainAssetReceiptVault deposits and withdrawals.

Variant	Value
OaSchema	0xffa8e8a9b9cf4a31
OaHashList	0xff9fae3cc645f463
OaStructure	0xffc47a6299e8a911
OaTokenImage	0xff8cd2927c8c86cb
OaTokenCredentialLinks	0xffbc38eb14ad2209

Details

• Purely additive: all existing magic numbers are unchanged.
• The new variants are also wired into the TryFrom<u64> match so they round-trip on decode (consistent with every other variant in that match).
• Each new variant has a test asserting its exact u64 prefix bytes (mirroring the existing per-magic tests), plus a round-trip test through TryFrom<u64>.

cargo build, cargo test (126 passed, 0 failed), cargo fmt, and cargo clippy --all-targets --all-features are all green. Mutation-validated: flipping OaSchema's value made test_oa_schema fail, then restored.

Out of scope

The issue's "Additional consideration" about supporting OA_SCHEMA as an extra CBOR map key (extending RainMetaDocumentV1Item beyond keys 0-4) is a separate, larger change and is not addressed here.

Closes #98

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 361ea542-5b59-4688-ab94-423bbf709816

📥 Commits

Reviewing files that changed from the base of the PR and between 95f16ac and a81af0c.

📒 Files selected for processing (1)

• crates/cli/src/meta/magic.rs

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-14-issue-98

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