Repository navigation

fix: resolve the openkal index and runtime revisions once per run #550

Job	Run time
documentation and repository checks	16s
what the change starts	7s
build-windows / build mcpp (windows-x86_64)	1m 26s
bootstrap / the newest release builds the tree (linux, when the pin lags it)	1m 31s
build-linux-arm / build mcpp (linux-aarch64)	1m 30s
build-linux / build mcpp (linux-x86_64)	1m 30s
bootstrap / the pinned mcpp builds the tree (macos-15, xlings install + mcpp build --strict)	1m 34s
bootstrap / the pinned mcpp builds the tree (ubuntu-24.04, xlings install + mcpp build --strict)	1m 31s
bootstrap / the pinned mcpp builds the tree (windows-2025, xlings install + mcpp build --strict)	1m 28s
build-macos / build mcpp (macos-arm64)	1m 31s
windows-e2e	0s
windows	0s
windows-msvc-xlings	0s
linux-e2e	0s
linux	0s
cross	0s
macos-ios	-1s
macos	-1s
target-matrix	-1s
openkal	-1s
macos-e2e	-1s
every e2e test runs somewhere	1s
	12m 20s