chore: version 0.2.0 + release-cadence rule in SPEC (goal 0045) (#87)

Cadence: a release tags when a user-visible capability goal archives
(goal 0042 just did); the asset is the launchable mill.app zip,
git-clone build stays the documented developer path.


Claude-Session: https://claude.ai/code/session_01FJ8wStsHyu7XPLTspNjMnQ

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: alicoding

build/config.yml

@@ -11,7 +11,7 @@ info:
   description: "Guardrailed agentic-workflow automation" # The application description
   copyright: "© 2026 Ali Al Dallal" # Copyright text
   comments: "https://github.com/alicoding/mill" # Comments
-  version: "0.1.0" # The application version
+  version: "0.2.0" # The application version
   # cfBundleIconName: "appicon" # The macOS icon name in Assets.car icon bundles (optional)
   #                               # Should match the name of your .icon file without the extension
   #                               # If not set and Assets.car exists, defaults to "appicon"