v1.2.1

Added

• Add missed-answer explanations to conjugation drills when packs provide verb
  type, stem, and notes metadata.
• Add shuffled conjugation entry selection so drills no longer follow the YAML
  file order by default.
• Add subjects as the preferred conjugation pack field while retaining
  backwards compatibility with legacy persons packs.
• Add optional per-step instruction text for transform drills so packs can
  show clearer prompts than the generic transform label.
• Add translation study/read-through mode via --study --translation.
  This walks through translation packs without scoring, showing source text,
  chunks, literal renderings, natural translations, hints, and optional
  pronunciation.

Updated

• Expand and clarify the Linguatrain LLM Authoring Specification for
  translation and companion-pack generation.
• Accept conjugation stems with or without a trailing hyphen in stem drills.
• Prefer source and target names for --match-options, while still
  accepting the older fi and en aliases.
• Accept transform entry notes in pack validation, matching the runtime and
  authoring docs.
• Document missed-answer conjugation explanations in the options reference and
  conjugation authoring guide.
• Document the --study --translation combination in the usage guide and
  options reference.

Fixed

• Fix conjugation category-identification option handling so legacy aliases are
  normalized and category filtering uses --category KEY.