feat: fix web build, add repo infra, port iOS engine modules, add routine screens
- fix(web): cast window through unknown in platform-sync.ts (TS2352)
- docs: add AGENTS.md, README.md, CLAUDE.md, .windsurfrules, .cursorrules, env.example
- feat(ios): port Recurrence.swift from web/src/lib/recurrence.ts
- feat(ios): port NLParser.swift from web/src/lib/nl-parser.ts
- feat(ios): port ContextMessages.swift from web/src/lib/context-messages.ts
- feat(ios): add CMRoutine model + Routines.swift engine with state machine + templates
- feat(ios): add RoutineListView, RoutineRunnerView, RoutineEditorView
- feat(android): add RoutineScreen.kt with list, runner, templates, step controls
Web: 373 tests passing, build succeeds with --webpack flag
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