Add continuous Reader scanning and lifecycle cleanup

[djwok]

Summary

• add optional continuous Reader scanning while preserving bounded scans by default
• emit discovered Readers through the existing real-time discovery listener until explicit stop or connection
• clean up Android scan, card-monitor, Card, and Reader resources when the module or owning activity is destroyed
• document the new scan lifecycle and add Android native source-contract regressions

Root cause

Android divided a five-second scan across five ACS Reader models, leaving roughly one second per model. ACR1555U discovery was unreliable in that window. Android also retained native ACS resources across app teardown, which could leave the Reader connected and no longer advertising after reopening.

Continuous mode gives each Reader model the configured timeoutMs dwell and keeps rotating until stopReaderScan() or connectReader() ends the scan. Android lifecycle cleanup is idempotent and best-effort because teardown cannot report failures to JavaScript.

Validation

• pnpm test -- --runInBand --watchman=false — 42 tests passed
• pnpm exec tsc --noEmit
• pnpm lint
• pnpm build
• pnpm --dir example exec tsc --noEmit
• Android :app:assembleDebug — successful
• Swift frontend parse — successful
• git diff --check

Full iOS workspace compilation remains blocked by stale CocoaPods paths in the example workspace before this module compiles. No real-device or ADB testing was performed.

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[djwok]

check and confirm no issues