Raise note_search limit to 100 while preserving the default and output budget. Return scoped-tool argument validation failures as tool errors so models can correct and retry instead of receiving MCP internal errors.
Validation: 64 focused tests, typecheck and changed-file lint passed. Full tests timed out with two heartbeat migration failures; full lint reports unrelated story-graph demo errors.
Release note: 笔记搜索单次最多支持 100 条结果;内置 MCP 参数错误会返回明确提示,便于模型纠正后重试。