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@stainless-code/codemap minor

feat(query): add --format diff and --format diff-json

Adds transport-agnostic diff formatters for query row sets shaped as:

SELECT
  'src/file.ts' AS file_path,
  42 AS line_start,
  'oldName' AS before_pattern,
  'newName' AS after_pattern
  • --format diff emits plain unified diff text, ready for git apply --check.
  • --format diff-json emits {files, warnings, summary} for agents that need structured hunks.
  • Source files are read at format time. If a file is missing or the indexed line no longer contains before_pattern, the formatter marks it missing / stale in diff-json and emits # WARNING: comments at the top of plain diff output.
  • Same formatter support is exposed through MCP / HTTP format: "diff" | "diff-json" on query and query_recipe.

This is read-only preview infrastructure — codemap never writes files.