* test: restore SSH bulk-open freeze coverage in headed CI
* test: record ten passing headed SSH freeze repetitions
* test: record ten passing headed SSH freeze repetitions
* test: route changed SSH freeze spec only to its dedicated lane
pnpm 12's npm_execpath is a Mach-O/PE binary. build-native-for-platform.mjs
still launched it with `node $npm_execpath`, which throws SyntaxError on
the binary header and fails every signed macOS dev-channel build.
Bound exclusive host navigation to a generation-aware latest-wins
single-flight so bulk open and switch fan-out stay responsive on large
remote fleets. Add freeze repro harnesses and navigated settlement.
Neil