Apply sequential line edits to a file

Question

An editing agent proposes line-range replacements against a small document. Apply them in order, with each edit seeing the document produced by the previous one, and report the final content.

```python
def solve(raw: str) -> str: ...
```

- The first line is the current line count `m`, followed by the `m` document lines. The next line is the edit count `k`, then `k` edit lines.
- Each edit line is `<start> <end> <replacement>` with 1-based inclusive bounds over the current document. Replace those lines with the single replacement line, preserving spaces inside the replacement.
- Apply edits sequentially; later edits index the already-updated document. All edits are valid.
- Return the final document lines, then a final line `lines=<count>`. Do not append a trailing newline.