* feat(vercel): start fresh sandboxes from a managed image instead of the deprecated runtime
Vercel deprecated Sandbox runtimes (node24/node22/python3.13) in Aug 2026 in favour of
images, and rejects runtime+image together and runtime with a snapshot source. New
terminal.vercel_image (default vercel/sandbox/universal:latest, Node 24 + Python 3.14)
picks the image for fresh sandboxes; a pinned terminal.vercel_runtime still works, wins
over the image and logs a deprecation warning; snapshot restores send neither.
Setup wizard prompts for the image, dashboard exposes both keys, status/config show the
effective choice, TERMINAL_VERCEL_IMAGE bridges config to the tool like its siblings.
* feat(config): migration 49 drops the seeded node24 Vercel runtime pin
Every pre-49 config.yaml carries terminal.vercel_runtime: node24 (the template default) and
the setup wizard mirrored it into .env as TERMINAL_VERCEL_RUNTIME. Both are the default
copied, not a choice, so the migration drops them and fresh sandboxes follow vercel_image;
node22 / python3.13 pins are the user's and survive. Persisted sandboxes are unaffected:
a snapshot restore never sends a runtime or an image.
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