README: package overview, quick start, deployment, release strategy

Fix: verify must report MISSING files, not silently skip them

Fix stray character in dual-licensing section

License: AGPL-3.0-or-later with dual-licensing note

Dashboard requirements (no SDR deps)

Legal disclaimer: receive-only, authorized use, evidence handling

Anti-tamper: SHA-256 manifest generation + HMAC-signed verification

Engine requirements (SDR side)

FastAPI dashboard backend reusing repo_get_* functions

Alternative Streamlit dashboard reusing repo_get_* functions

Vue 3 CDN frontend: alerts, noisiest channels, spectrum history chart

initial commit