Add remote fallback recovery sample

[hyeokjun32]

Summary

• add a curated remote fallback recovery telemetry sample
• document the primary connection_error -> fallback success starter evidence path
• cover the sample boundary and downstream AIGuard/Lab signal names in sample artifact tests

Tests

• PYTHONDONTWRITEBYTECODE=1 .venv/bin/python -m pytest tests/test_sample_telemetry_artifacts.py tests/test_remote_dispatch.py tests/test_docs_links.py -q -p no:cacheprovider
• PYTHONDONTWRITEBYTECODE=1 .venv/bin/python -m pytest -q -p no:cacheprovider
• git diff --check