* Add a Docker SSH watcher-isolation E2E test to verify remote relay-watch
- Covers two scenarios: crashed watcher children are respawned under the
same relay without dropping the terminal PTY or file-explorer view, and
a missing deployed relay-watcher.js artifact is repaired on reconnect
- Extracts shared connect/disconnect/reconnect logic out of the perf spec
into docker-ssh-relay-connection.ts, and adds docker-ssh-relay-processes.ts
for inspecting/signaling remote relay and watcher PIDs
- Wires the new spec into a dedicated CI job and pnpm script
* Fix Windows and Linux-only issues in Docker SSH watcher-isolation E2E ha
- node-gyp override only applies on Linux runners now, since the CI job
moved to ubuntu-latest but shares the workflow with non-Linux jobs
- spawn the e2e runner scripts through a shell on win32 to satisfy
Node's CVE-2024-27980 restriction on unshelled .cmd spawns
- harden relay process row parsing against empty pid/ppid fields so a
vanished /proc entry fails loudly instead of coercing to pid 0
- dedupe the reconnect helpers and export shellQuote for reuse across
the docker-ssh-relay test helpers
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