Ignore specific line

**What problem does this solve?**
I need a way to ignore linting on a specific line like others. For example `# noqa` in Ruff (Python)

**Proposed Solution**
Use `harper: ignore` or some other comments at the end of the line to enable this.

**Examples**
Currently, in typst, one of my second level tile is `== f`, but harper continues tell me this is a typo. I just want to ignore this line. Like `== f // harper: ignore`

**Component**
- [x] Core engine
- [ ] Plugin/Extension
- [ ] Other: _____

**Additional Context**
Like the summer semester 2026, we'd like to write as `SS26`. I don't want to add it to the dictionary. Or just like the case `f`. It's for global level but i need some more specific control just as the other linters in the programming languages.

The issue points to the core engine and Typst input but names no file or test. Start by locating the engine’s Typst parsing and diagnostic emission paths, then verify the agreed inline comment syntax; done means an ignored line produces no lint diagnostic while nearby lines still do, including the SS26 and f examples.

Written by the indexing model from the issue text.