0.0.3

Added

• Snapshots of the derived form over the whole vendored corpus (#18). An
  inventory carries one line per template with its group and field counts and
  the kinds it derives, so a change shows as one changed line naming the
  template rather than as a moved total; four whole documents are snapshotted
  beside it, from a 4-field form to a 303-field one. A test also derives twenty
  templates twice and compares the bytes, so the format's determinism claim is
  checked rather than trusted.
• The ADL 2 reader runs over the published archetype library (#49): 322
  archetypes parse, 306 flatten into an operational template, and 301 read.
  The 5 the reader refuses are mandatory unfilled slots, which is the
  adjudication on #13; the 16 it never sees are refused by the upstream
  flattener because a differential path in a specialised child does not
  resolve in its parent, in a 2013 export that predates the AOM 2 validity
  rules. The two families are counted apart, because they belong to different
  owners. CI fetches the library and sets FERROCHART_REQUIRE_ADL2, so a
  fetch that stops working is a red build rather than a skipped suite.
• A fetch script for the ADL 2 archetype library (#49), pinned to a commit of
  openEHR/adl-archetypes. It brings 322 ADL 2 archetypes and 330 ADL 1.4
  twins, 321 of them the same archetype in both dialects, which is the first
  real input for the property that both readers fill one internal constraint
  model. Nothing from it is committed: one of the 652 files states a licence
  and the rest state none, so the tree is fetched into a directory
  .gitignore refuses and PROVENANCE.md records the omission.
• The published form definition type (#17), in ferrochart-form. A definition
  is a tree of groups rooted at the template root; a group holds items, an item
  is a nested group or a field, and a field carries one of eighteen field
  kinds, one per thing a clinician can enter. Labels and help text are resolved
  per language from the archetype terminology, occurrences carry repeatability
  and optionality, an ELEMENT the template permits to be omitted carries the
  four null flavours openEHR RM Release-1.1.0 data_structures.html
  section 4.1 names, and a default_value prefills the field. The crate
  performs no I/O and depends on nothing else in the tree, so a third party can
  write a renderer against it. Every map in the format is ordered and every
  list keeps template order, so recompiling an unchanged template produces an
  identical document.
• The field derivation (#16), in ferrochart-compile: docs/architecture.md
  section 5 implemented against the internal constraint model, so it is written
  once for both ADL generations. Each permitted unit of a quantity carries its
  own magnitude bounds and decimal precision, so changing the unit changes
  both; a coded field's value set is enumerated with its rubrics where the
  archetype lists them and marked for expansion at render time where it only
  names them; an ordinal keeps list order, scores by its integer and stores its
  symbol's code; a date, time, date-and-time or duration pattern is honoured
  component by component; an occurrences upper bound above one makes an item
  repeatable; an assumed_value never reaches the data; and an open slot is
  recorded as undetermined content rather than rendered. A constraint the
  derivation does not understand is a typed error naming the node, never a
  permissive field. Each of the twelve cases docs/architecture.md
  section 5.2 lists as ungoverned carries a decision in code labelled as
  FerroCHART's own design. All 121 committed CKM templates the reader reads
  derive a form.