Add initial LLM rules

[jamoy]

No description provided.

[haruelrovix]

Checking formatting...
[warn] src/llm.md
[warn] Code style issues found in the above file. Forgot to run Prettier?

[loburets]

Not sure if this is realistic, some not complicated backend "services" files normally (now) can have 500-1000 lines.

If we do this, we should change the default structure to be like src/services/serviceName/serviceFile1.ts so they have room to growth

[jamoy]

its a guideline, not lint ;)

reviewing a new 1000 line file will be a chore.

there is an emphasis on changes made should be reviewable within 2 minutes.

[loburets]

not sure LLM needs it as it's already in the project settings and handled by TS-checkers