v0.3.0

TypeScript (npm)

• Added: var-vitest: Cell and doc string mismatches render vitest's expected/received diff in the terminal and VS Code peek view
• Added: Cell mismatches diff the authored line against the actual values and anchor editors at the first failing cell
• Added: var-vitest: Cell mismatch diffs show only the differing values, not the whole step text

Specification (all ports)

• ⚠️ Breaking: Sensors return a single parameter, table or doc string bare — positional arrays only for two or more values
  sensors no longer wrap a single comparison value in an
  array/list/tuple. When a step has exactly one comparison slot (one
  expression parameter, or just a trailing table/doc string), return the
  value itself: return total, not return [total]. Keep the positional
  array only when there are two or more slots. A sensor with no slots must
  return nothing — returning a value now raises ReturnShapeError (throw to
  fail instead). Single-slot returns are never read as positional arrays,
  so a custom parameter type transforming to an array is deep-compared
  as-is.
• ⚠️ Breaking: Context and action merge into a single stimulus step kind — defineState returns { stimulus, sensor }
  the context and action step kinds are gone; register
  both kinds of step with stimulus instead (TS/Kotlin stimulus(...),
  Python @stimulus(...), Java s.stimulus(...)). Behaviour is
  unchanged — a stimulus evolves state exactly as context/action did, and
  sensors are untouched. The arrange/act (given/when) concepts remain
  useful narration in your Markdown, but they share one mechanism.
  Snippet generation now infers stimulus for any step with steps after it
  and sensor for the last one, and generated snippets offer the other
  role as a single commented alternative.
• Added: Conformance pins each failure's anchor span, so a mismatch points at its first failing cell in every port