[agent] git message tags (#431)

Author: were

docs/git-msg-tags.md

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+# Guideline to Git Commit Message Tags
+
+## Generic
+- [enhancement]: Refactors or other non-functional changes that improve the codebase.
+- [bugfix]: Bug fixes.
+- [docs]: Documentation changes.
+- [agent]: Changes related to AI-powered development tools, and rules.
+
+## Frontend-related
+- [dsl]: Changes the public interfaces exposed to users.
+- [sugar]: Changes that did not change the core public interfaces, but improve the usability with more friendly wrappers or syntactic sugars.
+
+## Backend-related
+- [codegen.sim]: Changes related code gen Rust simulator.
+- [runtime.sim]: Changes related to the runtime for the Rust simulator.
+- [codegen.rtl]: Changes related to RTL code gen using PyCDE.
+- [uarch.rtl]: Changes related to the runtime for RTL, particularly the FIFO, and credit counter.
+
+## Test-related
+- [test.unit]: Unit tests.
+- [test.ci]: Continuous integration tests.
+
+When two or more tags apply, concatenate them, e.g., `[test.unit][bugfix]`.