GitHub only draws matrix boxes for the PRIMARY workflow's matrices;
everything inside a called workflow flattens into slash-joined names.
The generator + per-tag sub-workflow therefore bought no structure in
the graph and hid the support matrix in a script.
Invert it: install-e2e.yml now declares one job per {os,
install-method -> update-method} combination (2 linux + 8 windows +
6 macos - same 16 the generator produced, verified by inventory
before/after), each a matrix over the picked release tags. The graph
now renders one titled box per combination whose legs read
'... from vX' - the tag axis inside the combo axis. The per-OS run
workflows are unchanged: they own capability knowledge and natively
skip unimplemented method pairs and pre-desktop tags.
install-e2e-tag.yml and generate-e2e-matrix.mjs are deleted; adding a
method is now adding one job block here, implementing one is flipping
the run workflow's gate.
ethernet
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