Summary

This PR extends the JSON report output by adding dedicated fields for Statement Coverage and Branch Coverage.
These fields are included in both per-file summary objects and the top-level totals object when branch coverage is enabled.

Changes

• Added new summary fields:
  • percent_statements_covered
  • percent_statements_covered_display
  • percent_branches_covered
  • percent_branches_covered_display
• No changes were made to the underlying coverage calculation logic (this PR affects reporting only).

Related Issue / Context

• Discussion: Discussion: HTML coverage report layout (Statement/Branch columns and excluded column) #2081
• HTML report enhancement: Add Statement and Branch coverage columns to index.html report #2085