style: replace em dashes with colons; add .editorconfig

.editorconfig

@@ -0,0 +1,14 @@
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+
+[*.{dart,yaml,yml,json,md}]
+indent_style = space
+indent_size = 2
+
+[Makefile]
+indent_style = tab

.wiki/Home.md

@@ -20,5 +20,5 @@ print('Visible naked eye: ${vis.isVisibleNakedEye}');
 
 ## Pages
 
-- [API Reference](API-Reference) — Full function and type reference
-- [Visibility Criteria](Visibility-Criteria) — Yallop and Odeh crescent visibility criteria
+- [API Reference](API-Reference): Full function and type reference
+- [Visibility Criteria](Visibility-Criteria): Yallop and Odeh crescent visibility criteria

README.md

@@ -134,7 +134,7 @@ The full-mode features (DE442S JPL ephemeris, sub-arcsecond accuracy, rise/set e
 
 ## Architecture
 
-Two-mode design: lite mode uses Jean Meeus Chapters 47 and 48 for moon phase, position, and illumination — zero dependencies, no file I/O, works in any Dart environment. The GCRS-to-topocentric conversion applies ERA-only Earth rotation (no full nutation/precession), which introduces a ~1 degree systematic error acceptable for display and quick-estimate use cases.
+Two-mode design: lite mode uses Jean Meeus Chapters 47 and 48 for moon phase, position, and illumination: zero dependencies, no file I/O, works in any Dart environment. The GCRS-to-topocentric conversion applies ERA-only Earth rotation (no full nutation/precession), which introduces a ~1 degree systematic error acceptable for display and quick-estimate use cases.
 
 Full-mode features (DE442S ephemeris, sub-arcsecond accuracy, rise/set event finding) are in the TypeScript [moon-sighting](https://github.com/acamarata/moon-sighting) package.