docs: expand .rules.md with commit type guidance

[vdusek]

Clarifies which Conventional Commit types (feat/fix/perf/refactor/style) trigger a release and must be used for source code only, and maps the remaining types (test:, docs:, ci:, chore:, build:) to their correct scope.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.69%. Comparing base (390ccaf) to head (c12d6dd).
⚠️ Report is 2 commits behind head on master.

❗ There is a different number of reports uploaded between BASE (390ccaf) and HEAD (c12d6dd). Click for more details.

HEAD has 2 uploads less than BASE

Flag	BASE (390ccaf)	HEAD (c12d6dd)
integration	1	0
e2e	1	0

Additional details and impacted files

@@             Coverage Diff             @@
##           master     #863       +/-   ##
===========================================
- Coverage   86.57%   74.69%   -11.89%     
===========================================
  Files          48       48               
  Lines        2920     2920               
===========================================
- Hits         2528     2181      -347     
- Misses        392      739      +347     

Flag	Coverage Δ
e2e	?
integration	?
unit	74.69% <ø> (+0.06%)	⬆️

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