concealer 0.9.29

[0.9.29] — 2026-09-26

Added

• Demo mode — a friction-free way to explore concealer with sample data, no real vault
  or host needed. concealer demo [port] spins up an isolated throwaway vault (temp dir,
  master password demo1234), seeds six dummy secrets, and serves the web UI with a DEMO
  banner. The mobile app gains a matching "Try the demo — no host needed" button on the
  setup screen that loads the same sample set offline (a DEMO badge shows in the header; sync
  is disabled). All demo values are dummy (DEMO/sk_test_…).