Delete ignore_pr.md included in #204 (#207)

ignore_pr.md

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-# Add stdin support for prompt input
-
-## Summary
-
-This PR adds support for reading prompts from stdin when `--prompt -` is specified, following Unix/Linux conventions. This enables piping prompts from other commands, making mflux more composable in shell scripts and workflows.
-
-## Changes
-
-### Feature Implementation
-- **Added stdin support in `prompt_utils.py`**: When `--prompt -` is provided, the prompt is read from stdin
-- **Follows Unix conventions**: Uses `-` as the special marker for stdin input, consistent with tools like `cat`, `grep`, etc.
-- **Proper error handling**: Raises `PromptFileReadError` with clear message when stdin is empty
-- **Preserves existing behavior**: Regular prompts and `--prompt-file` continue to work as before
-
-### Code Improvements
-- **Converted print statements to logging**: Changed `print()` calls to `logger.info()` for better control over output
-- **Improved type annotations**: Changed `get_effective_prompt(args: t.Any)` to use proper `argparse.Namespace` type
-- **Added comprehensive tests**: Both unit tests and integration tests verify the functionality
-
-## Usage Examples
-
-```bash
-# Pipe prompt from echo
-echo "A beautiful sunset over mountains" | mflux-generate --prompt - --model dev --steps 20
-
-# Pipe prompt from a file
-cat prompt.txt | mflux-generate --prompt - --model dev --output result.png
-
-# Use in a pipeline
-generate-prompt-script.py | mflux-generate --prompt - --model dev --metadata
-```
-
-## Testing
-
-### Unit Tests (`tests/arg_parser/test_stdin_prompt.py`)
-- ✅ Basic stdin parsing (`--prompt -` returns "-")
-- ✅ Regular prompt still works unchanged
-- ✅ Whitespace trimming from stdin
-- ✅ `--prompt-file` takes precedence over stdin
-
-### Integration Tests (`tests/image_generation/test_stdin_prompt_integration.py`)
-- ✅ Single-line stdin prompt generates image with correct metadata
-- ✅ Multi-line stdin prompt is preserved correctly
-- ✅ Empty stdin shows appropriate error message
-- ✅ Shell piping with echo command works correctly
-
-All tests verify that the stdin prompt is correctly captured in the output metadata when `--metadata` flag is used.
-
-## Technical Details
-
-- Stdin reading happens in `get_effective_prompt()` when `args.prompt == "-"`
-- Uses `sys.stdin.read().strip()` to read and clean the input
-- Logging messages indicate when prompt is read from stdin vs file
-- Error handling for `IOError`, `OSError`, and `KeyboardInterrupt`
-
-## Breaking Changes
-
-None. This is a purely additive feature that doesn't affect existing functionality.
-
-## Future Considerations
-
-This implementation could be extended to other input arguments if needed, following the same `-` convention for stdin input.