v1.0.0 — First stable release

First stable release of form-studio, off pre-releases.

Since v0.2.0-rc.4

• Fixed the "Additional Settings" field editor rendering inside the
  drag-and-drop tree, where an ancestor transform could trap it in a
  local stacking context and let unrelated page elements render above
  it — it's now portaled to document.body.
• Fixed tooltip/info icons using a z-index that could tie with (and
  lose to) a host page's own sticky chrome — lowered to stay safely
  under it.
• Fixed the Monaco JSON editor panes showing a mismatched background
  strip above/below the editor, and columns not staying the same
  height as each other when one showed a parse error.
• Corrected the Visual Builder's compatibility diagnostics: dropped
  the internal [FS_*] error code from the user-facing message, and
  fixed semantic binding being hidden on any read-only field instead
  of only ones that need a legacy-schema migration first.
• Bumped @staple-verse/marker-template-runtime to the stable
  v1.0.0 release (no contract changes from rc.4).

No breaking API changes from v0.2.0-rc.4.