docs(site): add weekly update

Author: will-break-it

site/news/2025-01-27-weekly-progress-summary.md

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+---
+title: Weekly progress summary - January 27, 2025
+authors:
+- will
+tags: [progress, update, weekly]
+---
+
+## Haskell simulation updates
+
+- `short-leios` simulation now outputs diffusion latency data
+- Added support for different IB diffusion strategies:
+  - freshest-first: higher slot numbers requested first
+  - peer-order: requested in order of peer announcement
+- Added support for Vote (Send) and Vote (Recv) stages
+
+## Rust simulation progress
+
+- Added an "organic" topology generator that better matches mainnet topology
+- Generator creates clusters of colocated stake pools and relays
+- Uses stake to determine relay connectivity
+- Topology insights gathered from stake pool owners:
+  - Most pools have multiple relays (2312 relays across 1278 pools counted)
+  - Pool operators often run multiple colocated pools sharing relays
+  - Relays typically maintain ~25 active outgoing connections
+  - Incoming connections scale with stake weight (10-400+ connections)
+
+## DeltaQ update
+
+- Wrote a comprehensive report covering work since September 2024
+- Report available at [Report 2025-01.md](./delta_q/docs/Report%202025-01.md)