[shipmill-romamo]

Amends spec 007 on @romamo's answer on #134 (option 1): the data copy flag is --source-schema NAME, and the data_copy MCP tool's parameter is source_schema, because treaty reserves --schema on every command to print that command's schema.

Only the flag's name changes: the Behaviour prose, and S-007-1, S-007-2, S-007-6, S-007-9, S-007-12, S-007-13 and S-007-14 where they name the flag. pg_dump's own --schema stays as it is, and migrate --data-schema keeps its name. Nothing else in the spec changes.

Plan

• Serves: quality bar
• Files: docs/specs/007-data-copy-schemas.md
• Order: the spec text alone; Refuse a data copy the target can't hold before restoring (S-007-6..11) #125 and Check --schema values and add migrate --data-schema (S-007-12, S-007-13) #126 are reworded on their issues
• Proof: grep -- --schema leaves only pg_dump's flag and the note on why the name differs

Part of #124

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