Why: Main now serializes account recovery and requires maintenance CLI commands to open existing storage, deliver credentials through protected files and use file/environment DSN sources ahead of the deprecated flag.
Evidence: SELF /tmp/project-settings-backend-account-sync-full-20261014-973d52c1.json covers the combined Go suite and vet; /tmp/project-settings-backend-merge-schema-red-20261014-973d52c1.json and /tmp/project-settings-backend-merge-schema-green-20261014-973d52c1.json preserve a schema-guidance regression and its fix.
Impact: Keep the U7 transaction contract and the approved settings ownership APIs together. PostgreSQL CLI errors hide connection details while schema mismatch retains a safe migration instruction.
Refs: P2/P8, Dev #486, Backend #185
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