The key name is now the filename: a key "123" is refinements/123.json, listed by
stem and resolved directly by name everywhere (Studio, loader, Editor, sampler).
This fixes shortcuts spawning ghost keys — a dropped/loaded <key>.json is found
by the refiner's own path lookup with no scanning or adoption needed. Sidecars
keep a <key>.<mode> suffix (value function, sampler context, latents); only keys
that aren't a valid filename fall back to the old <prefix>_<md5> hash.
Clean break: legacy hashed files are not migrated (and are hidden from the key
list rather than shown as hash names). Exports now download as <key>.json so a
re-dropped export is already canonical — no tolerant filename/inner-field
reconciliation layer needed.
Import now prompts overwrite-or-cancel on a name collision (409 -> confirm ->
retry with overwrite), in both the Editor and the Refinement Key Loader node.
413 chunked upload (Vast.ai / Runpod proxy body caps) retained.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
