Add LintLang

[roli-lpci]

Adds LintLang, a deterministic static analyzer for the natural-language instructions that control AI agents.

Tool requirements

• I have not changed README.md directly. The contribution adds only data/tools/lintlang.yml.
• The tool has more than 20 GitHub stars (58 at submission time).
• The project has existed for more than three months (created 2026-02-28).
• The project is actively maintained (latest push 2026-08-11; multiple contributors recorded).
• The YAML description is under 500 characters.

Validation

• make render
• make test (8 passed)
• git diff --check

This pull request was created with AI assistance. The repository owner authorized the submission, and the exact one-file diff and claims above were checked before submission.