Archive & Integrate GSoC 2025 Final Outcomes into Repo Structure

[Jai-76]

Summary

GSoC 2025 has concluded with three successful projects, but their final
outputs, reports, and code are currently scattered across Medium blog posts
and external repositories, with no unified entry point inside this repo.

Context

The three 2025 GSoC projects were:

1. NDP-HNN (Lalith Baru) — Modelling Neural Developmental Programs of
   C. elegans using Growing Hypergraph Neural Networks (DevoGraph)
2. DevoTG (Jayadratha Gayen) — Dynamic GNNs for modelling C. elegans
   development (DevoGraph)
3. SustainHub (Vidhi Rohira) — Adaptive Agent-Based Model for Open-Source
   Community Sustainability

Problem

• The 2025/ folder exists in the repo but lacks final deliverables,
  summaries, or links to the scholars' work
• Final reports exist only on Medium and are not archived here
• New GSoC applicants for 2026 have no structured way to learn from 2025
  outcomes within this repo
• SustainHub introduced novel metrics (Harmony Index, Resilience Quotient,
  Reassignment Overhead) that are not documented in the repo at all

Suggested Actions

• Add a 2025/README.md summarizing all three projects with links to
  their repos, final reports, and key outcomes
• Archive final blog posts / reports as .md files under each project
  subfolder (similar to how 2022/2023 are structured)
• Document SustainHub's three new metrics (Harmony Index, Resilience
  Quotient, Reassignment Overhead) in the Open Source Sustainability folder
• Add a "Lessons Learned / Future Directions" section per project to
  guide 2026 applicants
• Link the 2025 GitHub Project Board from the README (currently listed
  as "2024" in the README text — possible copy-paste error)

Why This Matters

This repo serves as the primary discovery point for future GSoC applicants.
Rich, well-archived outcomes from prior years help candidates write stronger
proposals and build on existing work — directly improving the quality of
future GSoC cohorts.