Two issues caused coverage and docs badges to show "unknown":
1. Coverage regex expected decimal (100.00%) but pytest-cov outputs
100% when coverage is exactly 100. Made decimal part optional.
2. doc_coverage.py passed pct="100%" to a template that already had
%, producing (100%%). Removed the redundant % from the pct variable.
Also relaxed the doc coverage regex to not require closing ).
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emil