sync licenses.yaml self.version to 2.6.0

self.version is auto-synced from pubspec by make gen-build-info; pubspec
is already at 2.6.0 but the generated value had lagged at 2.5.0. Commit
the regenerated file so the working tree matches.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

assets/licenses.yaml

@@ -39,7 +39,7 @@ self:
   # Auto-synced from pubspec.yaml `version:` by `make gen-build-info`
   # (runs implicitly on every build/run/test). Don't hand-edit; bump
   # pubspec instead.
-  version: "2.5.0"
+  version: "2.6.0"
   homepage: https://github.com/postmeridiem/clide
   license: MIT
   license_file: assets/LICENSE