feat(MD054): auto-fix support for converting inline links to reference style

[zolotokrylin]

Summary

MD054 correctly detects inline links ([text](url)) when inline = false is configured, but rumdl check --fix leaves the file unchanged — no auto-fix is applied.

Expected behavior

Running rumdl check --fix with inline = false in [MD054] should convert inline links to reference-style:

Before:

See the [documentation](https://example.com/docs) for details.

After:

See the [documentation][documentation] for details.

[documentation]: https://example.com/docs

Suggested implementation

1. Collect all inline links in the file (skipping code spans and fenced blocks).
2. For each link, derive a slug label from the link text (lowercased, spaces → hyphens).
3. Deduplicate: reuse the same label when the same URL appears more than once; generate a -2, -3 suffix when the same text maps to different URLs.
4. Replace each [text](url) with [text][label].
5. Append new [label]: url definitions at the end of the file (skip any that already exist).

The same logic should apply to images (![alt](url) → ![alt][label]) when the inline style is disallowed.

Environment

• rumdl version: 0.1.80
• Config:

[global]
extend-enable = ["MD054"]

[MD054]
inline = false
autolink = true

[athyfr]

Suggestions (expand to see)

Precedence

Auto-fix should convert between link formats with a given precedence.

For example, it should convert to autolink if possible before full, collapsed, or shortcut, or url-inline.

In addition, there should be a new setting in MD054 to enforce this precedence.

Auto-Fix Conversion Between Link Formats That Are Not Inline

For example:

• autolink -> url-inline
• collapsed -> full
• full -> shortcut
• etc.

Thanks!