docs: add README, project docs, and design plans

ci: add GitHub Actions workflow for test, lint, and build

feat: wire up main entry point with background scanners

feat(clipboard): add clipboard copy support

test(transfer): add export, import, and manifest tests

feat(transfer): add session export and import

test(tui): add tests for app, components, and all views

feat(tui): add agents view for subagent usage

feat(tui): add session detail and project detail views

feat(tui): add analysis, projects, sessions, and tools views

feat(tui): add reusable UI components

feat(tui): add app shell and styles

test(store): add store and scanner tests

feat(store): add in-memory store and background scanner

test(parser): add parser unit tests