- Clarified hashline anchor format to emphasize `LINE:HASH` only without content suffix.
- Added explicit guidance on `set_line` with empty text behavior versus `replace_lines` for deletion.
- Added instruction to prefer `insert_after` over line replacement when adding fields/arguments/imports.
- Added common failure patterns section documenting anchor copying errors and wide range pitfalls.
- Updated all example tool calls to use concrete `LINE:HASH` format instead of template placeholders.
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