docs: highlight current unsigned beta and safe setup

[OnlineFix]

Behavior summary

Test-driven evidence

RED evidence

GREEN evidence

Complete test gate

• python -m unittest discover -s tests -p "test_*.py" -v
• python -m py_compile pearipherals.py pearipherals_core.py scripts/write_version_info.py tests/test_core.py tests/test_release.py
• git diff --check

Manual hardware scope

• Not tested on hardware
• Tested only the hardware/scenarios listed below

Input and registry risk

• No input-hook, Raw Input, synthetic-event, autostart or registry behavior changes
• Safety-sensitive behavior changed and failure/cleanup/restore tests are identified below

Rollback

Security and privacy

• No credentials, local planning files, full paths, device identifiers, raw traces, complete logs/configuration or registry exports are included
• Security-sensitive findings were reported privately rather than in this pull request
• Documentation does not weaken Windows security guidance or overstate signing/trust

Release impact

• No release/tag/asset impact
• Release documentation or workflow review is required
• This must not be published until trusted signing succeeds