Remove all capability knowledge from the combination generator: no
IMPLEMENTED table, no skipped matrix, no per-OS special cases. It now
only declares and expands - every {os, install-method, update-method}
combination is dispatched to its OS's run workflow, and each run
workflow natively skips (grey, job-level if on the method inputs) the
pairs its driver cannot run yet:
* install-e2e-run.yml gains install-method/update-method inputs,
gates on the supported pairs (curl-bash -> hermes-update/curl-bash),
and maps the method id to the sandbox script's --route internally;
* install-e2e-macos-run.yml is new - all pairs skip until a macOS
driver exists, and implementing one flips its job-level if;
* install-e2e-windows-run.yml already worked this way;
* install-e2e-skip.yml is deleted - nothing special-cases macOS
anymore, so the tag workflow is three identical OS fanouts.
Structure is now uniformly matrix(tag) -> matrix(combination) ->
run-or-skip, with capability knowledge living only next to each
driver. Generator shape/route filters/error paths re-verified; all
five workflows pass actionlint.
ethernet
6d94678e62