research: I-REC / Energy Web interoperability requirements

[jessicanath]

Summary

Closes #605

Adds docs/IREC_ENERGYWEB_INTEROP.md — a research document covering the technical and procedural requirements for bridging SolarProof certificates to I-REC(E) and Energy Web Origin, supporting the Level 3 roadmap item.

What's covered

Section	Contents
I-REC(E)	Integration path, required data fields (device + issuance), key gaps (MWh granularity, centralised registry, no native crypto proof)
Energy Web Origin	Integration path, EAC data schema, key gap (dual-chain EVM bridge required)
Comparison table	I-REC vs Energy Web across 7 dimensions
Recommended phases	Phase 1 (I-REC bridge, high priority), Phase 2 (EW bridge), Phase 3 (standard advocacy)
Open questions	5 blockers that need business/legal resolution before implementation

Key findings

• I-REC is the higher priority — broader market reach, REST API to Evident registry, medium integration complexity
• Energy Web requires an EVM bridge microservice — higher complexity, relevant for the EW ecosystem
• SolarProof's Ed25519 anchored readings are a differentiator — no existing standard requires or validates cryptographic MRV proofs; this is an advocacy opportunity
• MRV granularity gap: I-REC issues per MWh (monthly batches); SolarProof needs an aggregation step

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