Firebase and InstantDB importers, and table-by-table proof

Moving a backend in is now a verified, one-run move from three sources.

• Firebase importer. Firestore collections and subcollections become Postgres tables with a jsonb data column. Firebase Auth users move with their modified-scrypt password hashes, which the auth server verifies natively, so nobody resets a password. Cloud Storage buckets copy with a SHA-256 check per file.
• InstantDB importer. Every namespace, $users, and $files, with entity and user ids preserved so links keep resolving.
• Verification report, old versus new. Every import now ends with per-table source and target row counts and checksums, auth-user and storage-object counts, policy parity, and a sign-in proof. The verdict stays fail-closed.
• Console wizards for all three sources, with an optional sign-in proof.
• scribase/importers exports Firestore, Cloud Storage, and Instant apps into the folder layout the importer reads.
• Pricing changed in this release. Those plans have since been replaced by one price per project; current pricing is the only price list.
• MCP page and Claude Code skill for the preview branch, RLS test, confirm, and merge flow.