feat(core): new AvoidContractions rule

[elijah-potter]

Issues

No linked issue.

Description

Adds a new opt-in AvoidContractions linter that suggests expanded forms for common English contractions.

The rule covers deterministic contraction expansions such as:

• isn't → is not
• wasn't → was not
• don't → do not
• can't → cannot
• I'm → I am
• you're → you are
• they'll → they will

The rule is registered in the lint group and added to default_config.json under Style and Redundancy with state: false, so it is available but disabled by default.

Ambiguous contractions such as it's, he'd, and she's are intentionally excluded from this first implementation.

Demo

N/A

How Has This Been Tested?

Added unit tests for the new linter covering positive matches, suggestion output, casing behavior, typographic apostrophes, possessives/names, and intentionally excluded ambiguous contractions.

AI Disclosure

• I am a human and didn't use any AI.
• I used LLM features of my editor, but not an agent.
• I used an AI agent interactively.
• I am an agent or I got an agent to do the work autonomously.

If Your PR Implements or Enhances a Linter

• I made up the sentences in the unit tests.
• The sentences in the unit tests were generated by an AI.
• I'm using examples from the bug report / feature request.
• I collected real-world sentences for the unit tests.

Checklist

• I have performed a self-review of my own code
• I have added tests to cover my changes
• I have considered splitting this into smaller pull requests.

[hippietrail]

List of all the missing ones from dictionary.dict found using the regex ^[^/]*'[^/]*/

I made the full list before I went back to check for and find your note saying you left out the ones with multiple expansions intentionally. So those are mixed in with the missing ones with only a single expansion sorry.

[hippietrail]

Would be easier for us to scan for missing ones if these were alphasorted.

Missing, but this includes the ones with multiple expansions:

• couldn't've
• could've
• he'd
• he's
• how'd
• how're
• I'd
• I'd've
• it'd
• it's
• mayn't
• mightn't
• might've
• must've
• oughtn't
• shan't
• she'd
• she's
• should've
• that'd
• that'll
• that's
• there'd
• there'll
• there's
• they'd
• we'd
• what'll
• what's
• where'd
• who'd
• who'll
• who're
• who's
• who've
• why'd
• would've
• you'd

Maybe? Maybe not?

• ne'er
• nor'easter
• sou'wester
• y'all

[elijah-potter]

I went ahead and sorted it. I also added some of the unambiguous ones you listed. Free to take another look?