Add agents rule file

Author: iby

AGENTS.md

@@ -0,0 +1,26 @@
+---
+description: Agentic rules for code style, comments, and testing.
+alwaysApply: true
+---
+
+# Project
+- All code resides in the `source` directory.
+- All tests reside in the `source/Test` directory.
+- Follow existing file naming conventions, especially for test files – don't add prefixes or suffixes, keep it clean.
+
+# Code
+- Always respect consistency – if the existing code does something differently (before you modified it), stick with that.
+- Match existing code style and formatting in the project.
+- Prefer shorter, compact code (fewer lines when possible).
+- Avoid using of helpers and extensions, especially at a local level – prefer self-sufficient code.
+- Avoid using abbreviations for naming, except for absolutely universal words, like `min`, `max`, `html`, etc.
+- Place constructors at the top of the type. Do not move or reorder them.
+- Code for external frameworks must be compatible with their latest versions.
+- Avoid using unnecessary trailing decimal zeros in Double and Float types, i.e., prefer `1` vs. `1.0`.
+
+# Comments
+- Follow standard English grammar and punctuation.
+- End sentences with commas where appropriate.
+- Keep comments lean and purposeful — explain *why*, not *what*.
+- Comments must help understand the essence, not repeat what the code does.
+- Avoid filler words or redundant descriptions.