MainSequenceReportGenerator

Renders a MainSequenceReport as the two local artefacts aalekhMainSequence writes:

• markdown - a reviewable table of each module's abstractness (A), instability (I) and distance from the main sequence (D), worst first, with the off-sequence modules called out.

• json - the same data machine-readable.

Both are pure string transforms - no Gradle, no I/O.