DECK and HST frontends:
- Add 4-digit PIN lock screen (default: 1234)
- PIN stored in sessionStorage (persists during browser session)
- Keypad with keyboard support
- Add meta robots noindex/nofollow tags
- Created robots.txt to disallow all crawlers
Security note: This is client-side only, not cryptographically secure,
but sufficient to prevent casual access and search engine indexing.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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