feat: improve macOS DMG installer

[bniladridas]

Summary

Automated DMG packaging with generated .DS_Store, branded installer window, and expanded verification.

Changes

• build.sh: compile AppIcon via actool with --app-icon flag, extract AppIcon.icns for both app bundle and DMG volume icon
• package.sh: generate .DS_Store programmatically via generate-dsstore.py instead of AppleScript (which no longer persists background on macOS 15); stable volume name Alma (no version) so aliases stay valid
• verify.sh: add DMG resource checks (background image, .DS_Store, hidden flag); pre-detach stale mounts to avoid Resource busy
• generate-icons.sh: render canonical logo.svg → AppIcon.appiconset for all macOS icon sizes
• generate-dmg-resources.sh: render background artwork → DMG background.png
• generate-dsstore.py: create .DS_Store with background alias, window bounds, icon positions, and view options — no Finder needed
• ADR 0009: document DS_Store generation strategy and Alias vs Bookmark discovery
• README: update script table and add implementation note

Verification

All 28 verify checks pass. DMG tested end-to-end: app icon, volume icon, background image, window layout, icon positions persist through mount/unmount cycles.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
alma	Ready	Preview, Comment	Jul 7, 2026 8:28pm

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