feat(run): add unified seat health probe #1124

Job	Run time
lint	25s
test (3.10)	7m 38s
test (3.11)	8m 0s
content-guard	7s
test (3.12)	12m 12s
changes	6s
quickstart-smoke (windows-latest)	52s
quickstart-smoke (macos-latest)	27s
component-manifest-provenance	17s
repo-metadata	21s
quickstart-smoke (ubuntu-latest)	24s
windows-native-acceptance	1m 3s
install-from-source (workspace+codex+openclaw, --depth workspace --harnesses codex,openclaw)	22s
install-from-source (workspace+claude+openclaw, --depth workspace --harnesses claude,openclaw)	23s
install-from-source (repo+claude+publisher, --depth repo --harnesses claude --include publisher)	18s
install-from-source (repo+claude, --depth repo --harnesses claude)	21s
install-from-source (kitchen-sink, --depth workspace --harnesses claude,codex,openclaw,hermes)	30s
install-from-source (workspace+hermes, --depth workspace --harnesses hermes)	24s
install-from-source (repo+codex, --depth repo --harnesses codex)	21s
install-from-source (workspace+none, --depth workspace --harnesses none)	21s
Windows (stable, default features)	-1s
Feature configuration (${{ matrix.name }})	-1s
notify-build-and-test (windows-latest)	-1s
MSRV (Rust 1.85)	-1s
notify-build-and-test (ubuntu-latest)	-1s
evidence-ledger-test	-1s
build-and-test	-1s
	34m 45s

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