Probe now emits HOST_DEPS (ok|missing) based on whether
node_modules/better-sqlite3/build/Release/better_sqlite3.node exists
— the canonical proof that `pnpm install` ran and the native build
step succeeded. Step 1 (Node bootstrap) skips when HOST_DEPS=ok
instead of always re-running setup.sh. Probe now genuinely routes
step 1 the same way it routes every other step.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>