Implement the §4.3 ordinal rule and §3.4 block lift. Each `ParsedBlock`
maps to a `kb_core::Block` variant carrying a `CommonBlock` whose
`block_id = id_for_block(doc_id, payload_kind, heading_path, ordinal,
source_span)`. Ordinals are scoped to `(heading_path, payload_kind)`,
0-based, in document order — three paragraphs under one H1 get 0/1/2,
a code block under the same H1 starts fresh at 0, a paragraph under a
different H1 also starts at 0.
`payload_kind` is the lowercase-no-spaces convention from §4.2:
"heading", "paragraph", "list", "code", "table", "quote", "imageref",
"audioref".
`ListBlock.items` re-uses the parent list's `CommonBlock` per §3.4 (no
per-item BlockId is allocated). `AudioRefBlock` placeholder fields
(`asset_id`, `duration_ms`) are filled in by P8 — for now we synthesize
the minimal record so the document is well-typed.
Tests pin the four §4.4 ID properties (1000-iteration determinism, NFC
≡ NFD Korean path, `./a/b.md` ≡ `a/b.md`, ordinal grouping). Provenance
and title/lang lift land in the next commit.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
altair823
fc05f3a2be