Review found verify-type-equiv only scanned docs the manifest already named, so
a type-equiv block in an unmanifested doc was silently skipped — defeating the
1:1 guarantee. Scan all docs in the markdown glob scope instead, so an orphan
block in any doc is caught. Also parse `abstract class` in blockSymbol (matches
sourceDeclaration's class support).
persistence.md listed the SessionPersistence surface as create/append/load/list;
the abstract service also exposes has/delete. AGENTS.md's doc-sync command
summary omitted verify-md-links and verify-type-equiv.
A new docs/core-data-structures/ folder: a self-contained core.md defining what
counts as a "core" data structure (the agent-loop spine) and covering the spine
vocabulary, plus per-seam sub-pages (llm-streaming, session, persistence, tools,
bash). Type definitions are pasted verbatim via `ts type-equiv` blocks and
drift-checked by verify-type-equiv. Cross-linked from architecture.md; the
`ts type-equiv` mechanics are documented in development.md.
