Keep background service logs out of the Exo REPL

[alanagoyal]

Fixes #183.

Summary

Background service log tails currently write over the terminal UI while a user types. Stop streaming adapter and scheduler logs into the REPL, and add ./exo.sh logs to follow both logs from a separate terminal. Guardian-triggered REPL restarts remain intact.

Deduplicate identical WhatsApp QR notifications while preserving rotated QR codes and new pairing sessions. Update launcher and pairing documentation.

This complements #254, which skips redundant adapter setup prompts. The focused regression tests also pass with that patch applied.

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Validation

• pnpm check: lint, typechecking, and all 162 tests pass.
• pnpm format:check and pnpm docs:build pass.
• Bash syntax checks pass.
• cargo clippy --workspace --all-targets -- -D warnings passes.
• Regression coverage includes log isolation and viewing, guardian restarts, exit status and shutdown, and QR deduplication and rotation.
• Verified the before/after behavior using the real Exo terminal UI, injected service logs, and isolated demo state with stubbed background services. No model calls or live WhatsApp pairing were performed.