workspace: add rule for test execution patterns (#11521)

* workspace: add rule for running commands in sequencer venv

* workspace: add rule for comment style conventions

* workspace: add rule for test execution patterns

Author: AvivYossef-starkware

.cursor/rules/test-execution/RULE.md

@@ -0,0 +1,9 @@
+---
+description: "Test execution patterns and best practices"
+globs: "**/*.rs"
+alwaysApply: true
+---
+
+# Overview
+
+When running specific tests, always use `-p` to compile only the specific crate.