📖 docs: clarify partial credit logic for Branch-Protection tiers

[aban-alazzeh]

What kind of change does this PR introduce?

Docs update 📖

• PR title follows the guidelines defined in our pull request documentation

What is the current behavior?

The documentation for the Branch-Protection check states that "Each tier must be fully satisfied to achieve points at the next tier." This implies an all or nothing scoring model for each tier, leading users to believe they will receive zero points for a tier if even one requirement is missed

What is the new behavior (if this is a feature change)?**

This PR updates the documentation to accurately reflect the implementation logic in checks/evaluation/branch_protection.go. The updated wording clarifies that while tier progression is strict (you cannot earn points for Tier N+1 until Tier N is complete), users do receive partial credit for each requirement met within their current active tier via the normalizeScore function.

• Tests for the changes have been added (for bug fixes/features)

Which issue(s) this PR fixes

Fixes #5009

Special notes for your reviewer

I’ve updated docs/checks/internal/checks.yaml and ran the generation script to refresh docs/checks.md. This change makes the "partial credit" logic in normalizeScore more transparent, so users can clearly see how it works.

Does this PR introduce a user-facing change?

NONE

[spencerschrock]

Thanks!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.78%. Comparing base (353ed60) to head (7da7314).
⚠️ Report is 354 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5010      +/-   ##
==========================================
+ Coverage   66.80%   69.78%   +2.98%     
==========================================
  Files         230      252      +22     
  Lines       16602    15736     -866     
==========================================
- Hits        11091    10982     -109     
+ Misses       4808     3873     -935     
- Partials      703      881     +178     

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