0.0.6

0.0.6 — Multi-key data model (schema-based)

• The filename key config is now a positional slot array — TrellisSchema { slots: KeySlot[]; separators: string[] } — instead of three scalar fields.
  The single-key default is a 2-slot [tag, name] schema; runtime behaviour is
  unchanged.
• keyPosition (prefix/suffix) is absorbed into slot order — prefix =
  [tag, name], suffix = [name, tag]. No separate field.
• Existing settings migrate automatically (schemaFromLegacy): saved
  namespace / separator / keyPosition data is converted to a schema on
  load, losslessly.
• Lays the general-form foundation for multi-key (multiple tag slots, multiple
  separators). The multi-key UI and multi-separator parsing are deferred to an
  advanced mode, so the core never needs rewriting again.
• Fix: settings no longer share the module-level default-schema object (an edit
  to the namespace/position could previously mutate the shared default).