CRITICAL: Move NWC wallet secret from plaintext nwc_connection.txt to OS
keychain. The NWC secret is a private key that can authorize Lightning
payments — storing it in plaintext allowed any process to steal funds.
Security fixes:
- NWC secret stored in OS keychain as "nwc_<npub>" (per-account)
- accounts.json.enc is now the sole source of truth for cold boot
- Eliminate bunker_uri.txt, last_account.txt, nwc_connection.txt
- Legacy files deleted on first startup (one-time cleanup)
- logout(deleteKey=true) now removes account from accounts.json.enc
- Corrupted accounts.json.enc backed up as .corrupt.<timestamp>
Cold boot rewrite:
- loadSavedAccount() routes by SignerType from accounts.json.enc
- No longer reads stale bunker_uri.txt (fixes nsec→bunker confusion)
- No longer reads last_account.txt (uses activeNpub from metadata)
Multi-account improvements:
- NWC connections are per-account (switch account = switch wallet)
- Each account type (Internal/Remote/ViewOnly) loads correctly
- saveBunkerAccount() no longer writes to bunker_uri.txt
Updated 8 existing test files to use accountStorage instead of
writing legacy files directly.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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