Test DIA extern interfaces and generated metadata

[Siddharth2207]

Summary

• exercise the deployed DiaWords.extern and integrity surfaces instead of bypassing dispatch
• pin advertised ERC-165 interfaces, committed metadata, authoring metadata, and generated pointer tables
• verify the real dia-price subparser path emits the expected extern opcode and operand

Test plan

• nix develop -c forge fmt --check
• nix develop -c forge test (24 passed, 0 failed)
• independent review and re-review: approved, no findings

Closes #11
Closes #18
Closes #19
Closes #20
Closes #21
Closes #32

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[Siddharth2207]

• Deploy DiaWords deterministically via Zoltu #39
• Restore dia-price parse->eval happy path; fix stale encoding-drift comment #36
• Align rainlang V3 encoding and document soldeer pins #38
• Stabilize DIA fork fixtures and RPC config #37
• Standardize DIA codegen and import paths #35
• Test DIA extern interfaces and generated metadata #34 👈 (View in Graphite)
• Harden DIA price validation #33
• 2026-05-16-update-dia-oracle

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