v0.26.0

Changed

• Editor completion now offers only parser-valid keywords per chart type.
  Structural keywords are sourced from a single authoritative, parser-validated
  registry (STRUCTURAL_KEYWORDS), with TAG_SUPPORTING_TYPES derived from it.
  Fixes two keywords the popup offered that the parser rejects: tag on RACI
  (no tag-block support) and no-descriptions on cycle (a removed keyword). The
  completion-conformance suite now locks structural keywords and the spec §1.3
  tag-support list against the parsers so they can't drift again.

Removed

• DiagramSymbols.keywords (from @diagrammo/dgmo/advanced and the
  deprecated /internal). The field carried per-extractor reserved-word lists
  that nothing consumed in production; structural-keyword completion is now
  driven by STRUCTURAL_KEYWORDS. Breaking for any direct consumer of the
  extractor symbol shape.

Fixed

• Export renders no longer leave a tall band of dead space below short
  flowchart, state, and RACI diagrams. In export mode the canvas height is now
  fitted to the scaled content; the interactive preview keeps its fit-to-pane
  behaviour.