docs: update LinkedIn post draft for demo release

Author: SL-Mar

LINKEDIN-POST.md

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+# LinkedIn Post Draft — Windmar Demo
+
+---
+
+I open-sourced WINDMAR — a physics-based weather routing engine for merchant ships.
+
+Most voyage optimization tools are black boxes. Windmar puts the physics front and center: Holtrop-Mennen resistance prediction, STAWAVE-1 wave added resistance (ISO 15016), SFOC curves at variable engine loads, and seakeeping safety constraints — all calibratable from your own noon reports and engine logs.
+
+Try it locally in 2 minutes — no build step, no credentials needed:
+
+```
+mkdir windmar && cd windmar
+curl -LO https://raw.githubusercontent.com/windmar-nav/windmar-demo/main/docker-compose.standalone.yml
+curl -L -o .env https://raw.githubusercontent.com/windmar-nav/windmar-demo/main/.env.standalone
+docker compose -f docker-compose.standalone.yml up -d
+```
+
+Open http://localhost:3000 — wind data loads automatically from NOAA GFS.
+
+What's included:
+- A* and Dijkstra weather-aware route optimization (6 variants: fuel / balanced / safety)
+- Real-time GFS wind fields with Windy-style particle animation
+- Wave, current, SST, and ice overlays (with free Copernicus Marine credentials)
+- IMO CII compliance tracking and FuelEU Maritime GHG intensity
+- Engine log analytics: speed-power scatter, fuel distributions, voyage KPIs
+- Monte Carlo confidence intervals (P10/P50/P90 for ETA and fuel)
+- 9 pre-validated commercial strait shortcuts (Gibraltar, Dover, Malacca, Hormuz...)
+- Charter party weather clause tools
+
+The stack: FastAPI + Next.js + PostgreSQL + Redis, fully containerized.
+
+Important caveat: this is an educational release. The vessel model ships with default MR tanker parameters not yet calibrated against sea trial data. Routing algorithms have not been benchmarked against commercial solutions. A sea validation campaign is planned — results will be published.
+
+Full source code is Apache 2.0 licensed. If you want to improve it, fork it. If you want a production-ready solution, a commercial version is in development.
+
+Demo: https://github.com/windmar-nav/windmar-demo
+Source: https://github.com/windmar-nav/windmar
+Docs: https://windmar-nav.github.io
+
+#maritime #shipping #weatherrouting #opensource #python #docker #voyageoptimization #decarbonization #navalarchitecture
+
+---
+
+*Attach: 4 screenshots from docs/screenshots/ — weather-wind.png, route-portugal-casquets.png, engine-log-analytics.png, vessel-model.png*