[Test] Pulse v5: Regression test suite for onboarding → OTP → balance → repeat balance path

[islandbitcoin]

Summary

No automated regression coverage exists for the core happy path. Manual testing has caught multiple regressions (session persistence, balance display, re-link prompts) that should be caught automatically.

Required test coverage

1. New user onboarding (OTP sent to WhatsApp sender number — no phone prompt)
2. OTP verification → account linked → balance shown
3. Immediate follow-up: check my balance → balance shown (no re-link prompt)
4. Repeat: check my balance again → same result
5. Send flow starts correctly from linked state

Acceptance criteria

• Automated test covers full onboarding → OTP → balance → repeat balance path
• Test uses stub adapter (not live Flash API)
• CI runs test suite on every PR
• Test catches the session persistence bug (issue [Bug] Pulse v5: Auth/session not persisted after successful OTP link #38) if it regresses

Dependencies

• Issue [Bug] Pulse v5: Auth/session not persisted after successful OTP link #38 (auth persistence bug) must be fixed before tests will pass
• Issue [Arch] Pulse v5: Stabilize wallet tool wiring — replace direct patches with proper adapter injection #40 (adapter injection) needed for clean test stub setup

Notes

Hold for Dread go-ahead before implementation.