Bring core-parser.md in line with the resolved design in CONTEXT.md and
ADRs 0004/0005, and promote a new decision to normalise ingredient/cookware
units.
- Full sync of the core-parser spec: diagnostics/total-function channel,
container blocks (ListItemBlock, BlockquoteBlock), RawInline alongside
RawBlock via position-slicing, the unified WikilinkNode/TransclusionNode
shape as two typed nodes, and the minimal remark plugin set.
- New ADR 0006: normalise ingredient/cookware units via a known-alias table
with passthrough, case-insensitive, canonical-only; align Timer matching
to case-insensitive too.
- SPEC.md: units are normalised (new Units section, alias table); Timer table
marked case-insensitive.
- CONTEXT.md: add Unit Normalisation entry, resolve the open item.
- fixtures/basic.md: add a blockquote (callout) carrying an annotation and a
non-canonical unit so the integration test exercises containers and
normalisation.
- Expand the core test.todo checklists to cover the new behaviour (containers,
raw fallbacks, diagnostics, unit normalisation, wikilink/transclusion
variants); still pending, suite stays green.