Merge pull request #2 from riccjohn/fix/1-macos-date-compatibility

fix: Add macOS BSD date compatibility

fix: Add non-interactive mode support to installer

feat: Add configurable label display and dimmed separators

feat: Add dimmed color theme for daily progress bar

fix: Correct daily recommendation calculation logic

chore: Exclude .serena directory from version control

docs: Update statusline screenshot with latest features

docs: Update README with comprehensive feature documentation

feat: Add monthly cost usage tracking section

feat: Add unified cache dependency tracking

docs: Document three-stage pipeline architecture

refactor: Eliminate redundant calculations in combined display

feat: Add comprehensive config validation at startup

refactor: Extract layer calculation logic to reusable module