feat(policy): GS Methodology: Technologies and Practices to Displace Decentralized Thermal Energy Consumption v5.0 – Policy Implementation and docs

[saharshkhicha18]

This PR extends the digitization of the Gold Standard Methodology for Technologies and Practices to Displace Decentralized Thermal Energy Consumption (TPDDTEC) from v3.1 to v5.0.0 in Hedera Guardian to support the updated methodology and policy workflow.

Changes

• Design and approve schemas required for the methodology.
• Implement user onboarding workflows for Project Proponents and VVB Users.
• Implement Project Proponent, VVB User, Technical Advisory Committee, NGO Supporter, and Admin policy workflows.
• Implement the v5.0 conservativeness stack (90/10 uncertainty rule, per-capita baseline caps, Downward Adjustment Factor, BAU ceiling, Hawthorne Effect adjustment, market and embodied leakage).
• Implement vintage-based issuance and VER token minting.
• Add workflow documentation (README).
• Complete policy implementation.

Schema Design and Approval

• Project Developer onboarding schema
• VVB User onboarding schema
• Key Project Information schema
• Project Design Document (PDD) schema
• Project Description schema
• Emission Reductions schema (per-vintage calculation row)
• Baseline Parameters schema
• Project Technology Parameters schema
• Stakeholder Consultation schema
• Annual Report schema
• Monitoring Report schema
• Vintage schema
• CDM additionality tool schemas (Tool 01, Tool 19, Tool 21) and supporting step schemas
• Small-scale project activity type schemas (Type I, Type II, Type III)

Policy Development

• User onboarding workflow
• Project Proponent workflow
• VVB User workflow
• Technical Advisory Committee / NGO Supporter comment workflow
• Admin workflow
• Emission reduction calculation logic (custom logic blocks, math block, and published formula document)
• Vintage selection and mint workflow

Not Included

• Tool development (not required / not implemented in this phase)
• Test cURL requests (to follow in a subsequent PR)
• Test fixtures / synthetic dataset (to follow in a subsequent PR)
• Screenshots for methodology-specific steps
• Published IPFS / Hedera registry topic ID

Checklist

• Documented (README, Policy, Schemas)
• Tested (End-to-End) — not yet; this is an initial PR submitting the policy file only

Notes

This PR includes the implementation of the Gold Standard Methodology for Technologies and Practices to Displace Decentralized Thermal Energy Consumption (TPDDTEC) v5.0.0 policy.

v5.0 narrows scope to unmetered technologies only — metered devices (electric, metered biogas/LPG) are covered by the separate MECD methodology. The methodology is published by Gold Standard under the working title Reduced Emissions from Cooking and Heating (RECH).

The calculation is currently represented in three places (documentation formulas, custom logic blocks, and the FCB math block), which can drift independently. Guidance on which should be canonical would be welcome.