docs: add Architecture and Acknowledgments sections; ci: add --fatal-infos to dart analyze

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         with:
           sdk: ${{ matrix.dart-version }}
       - run: dart pub get
-      - run: dart analyze
+      - run: dart analyze --fatal-infos
       - run: dart test
 
   format:

README.md

@@ -68,6 +68,10 @@ Haversine distance between two points in kilometers (spherical Earth approximati
 | `kaabaLng`     | 39.826150 | Ka'bah center longitude (degrees east) |
 | `earthRadiusKm`| 6371      | WGS-84 volumetric mean radius          |
 
+## Architecture
+
+All calculations use the forward azimuth formula from spherical trigonometry. Great-circle paths use spherical linear interpolation (Slerp). Distance uses the haversine formula. The Ka'bah coordinates are fixed constants verified against published GPS surveys.
+
 ## Compatibility
 
 Dart 3.7+. Works with Flutter and standalone Dart applications.
@@ -77,6 +81,10 @@ Dart 3.7+. Works with Flutter and standalone Dart applications.
 - [qibla](https://www.npmjs.com/package/qibla) (npm) - The TypeScript version of this package.
 - [pray-calc](https://github.com/acamarata/pray-calc) - Islamic prayer times calculator.
 
+## Acknowledgments
+
+Ka'bah coordinates verified against published GPS surveys and cross-checked with satellite imagery. Spherical trigonometry formulas follow the standard forward azimuth derivation used in aviation and geodesy.
+
 ## License
 
 [MIT](LICENSE)