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Vance Ingalls
19756faa5d
Closes the remaining Tier 2/3 gaps from the SDK surface audit that motivated #2092 — real, contained fixes short of the two genuinely architectural items (a live-DOM apply adapter, structural editing ops) that need their own design pass, not a quick patch. Variable CRUD was write-only and creation-blocked: setVariableValue existed, but there was no getVariableValue, listVariables, declareVariable, or removeVariable — and writeVariableDefault intentionally refuses to create an undeclared variable ("keep the schema authoritative"), so a variables panel (list what exists, read current values, let someone add one) could not be built against the SDK at all. - getVariableValue(id) / listVariables(): thin reads over the existing readVariableDefault / a new listVariableDecls. - declareVariable(decl) / removeVariable(id): new EditOps with full undo/redo support via a new patch path (/variable-decls/{id}, distinct from /variables/{id} which is default-only) — removeVariable's inverse bundles the original array index so undo reinserts at the same position instead of appending, mirroring handleRemoveElement's siblingIndex. Export gaps (same shape as #2092's fixes — the logic already existed, just wasn't reachable): resolveScoped, findById, escapeHfId from engine/model.ts; readVariableDefault from engine/variableModel.ts. 17 new tests across mutate.test.ts (declareVariable/removeVariable engine semantics + undo), session.test.ts (Composition-level API), and smoke.test.ts (export-surface import check). 439/439 sdk tests passing. Full workspace build (incl. studio) verified clean.