99.0%, a new in-house front end, and an honest denominator change

A new front end cuts parse-negative failures from 607 files to 80; honouring YAML list-form flags drops the denominator by 181 executions and the score is republished.

6fc39171 (98.1%) is the new front end built for correct early errors. 321c328b reaches 99.0% (95,091 of 96,029). 8cec7647 then honours YAML list-form flags: metadata, which removes 181 phantom executions and changes the denominator to 95,848; the number was republished as 99.2% rather than left inflated.