Configure fixie (AI dev tool)

[benchristel]

Summary:

We should discuss as a team whether we want this, but I'm putting it up as a proposal
and a demonstration of how I think fixie should be configured.

More information: https://github.com/khan/fixie

Issue: none

Test plan:

fixie should magically improve things.

[github-actions]

🛠️ Item Splitting: No Changes ✅

[github-actions]

🗄️ Schema Change: No Changes ✅

[github-actions]

Size Change: 0 B

Total Size: 499 kB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	20.5 kB
packages/keypad-context/dist/es/index.js	1 kB
packages/kmath/dist/es/index.js	6.36 kB
packages/math-input/dist/es/index.js	98.5 kB
packages/math-input/dist/es/strings.js	1.61 kB
packages/perseus-core/dist/es/index.item-splitting.js	11.9 kB
packages/perseus-core/dist/es/index.js	25.1 kB
packages/perseus-editor/dist/es/index.js	102 kB
packages/perseus-linter/dist/es/index.js	9.3 kB
packages/perseus-score/dist/es/index.js	9.7 kB
packages/perseus-utils/dist/es/index.js	403 B
packages/perseus/dist/es/index.js	196 kB
packages/perseus/dist/es/strings.js	8.27 kB
packages/pure-markdown/dist/es/index.js	1.39 kB
packages/simple-markdown/dist/es/index.js	6.71 kB

_{compressed-size-action}

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (841037b) and published it to npm. You
can install it using the tag PR3516.

Example:

pnpm add @khanacademy/perseus@PR3516

If you are working in Khan Academy's frontend, you can run the below command.

./dev/tools/bump_perseus_version.ts -t PR3516

If you are working in Khan Academy's webapp, you can run the below command.

./dev/tools/bump_perseus_version.js -t PR3516