Two structural changes to the combination fanout:
1. Tags become the OUTER axis, as a sub-graph per starting version:
install-e2e.yml fans a plain matrix over the picked tags into a new
per-tag reusable workflow (install-e2e-tag.yml), which runs the
combination generator for that one tag and fans out one job per
{os, install-method, update-method}. The Actions graph now reads
'from vX -> windows: install -> update' per leg. Nothing is
hardcoded in the workflows: the tag workflow calls the generator
itself.
2. Native skips move to the point that owns the capability knowledge:
macOS combos (no driving workflow exists) grey out in the tag
workflow via install-e2e-skip.yml, untouched by the tag axis; ALL
windows combos dispatch to install-e2e-windows-run.yml, which takes
install-method/update-method inputs and natively skips the pairs
its driver cannot run yet - so implementing a windows method is a
change in the run workflow + driver only. The driver's -Route ids
now match the generator's method ids verbatim.
Generator output shape, route filters, and all error paths re-verified
locally; all four workflows pass actionlint; driver re-parses clean
pure-ASCII.
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