Follow-up from #1362 review. The launchable path works and is a big improvement, but a few structural items to clean up:

• Extract helpers from the monolithic beforeAll in brev-e2e.test.js (e.g. createBrevInstance, bootstrapLaunchable, pollForSandboxReady)
• Deduplicate the brev create + error recovery logic between launchable and bare paths
• Remove phantom version: 1 from the manual registry write (not part of the registry schema in bin/lib/registry.js)

None of these are regressions — the launchable path is new code. Just housekeeping.