Why: MiniMax-M3 emits XML-RPC-style {"item": ...} single-key wrappers on
array fields (kv/cells/items), bare scalar table cells, and page
submission delegated to the general sub-agent had no generative-ui
tool - observed live on dev (events seq 1395/1396/2171) where every
present with kv/table/list nodes failed invalid-spec and the delegated
retry reported the tool missing.
Evidence: red test reproducing the exact production error
(.nodes.1.kv of type [][2]string) goes green after the repair; full
genui/prompts/runtime/runmgr suites pass (SELF); mismatched-length
cells stay untouched by a dedicated guard test.
Impact: generative-ui pages with kv/table/list nodes save successfully
again; the general sub-agent can submit pages (tool resolves only when
the plugin exposes it, so absent plugins are unaffected).
Refs: dev task card feature/genui-spec-repair; dev conversation
激活验证-1012.
weichen