fix(mcp): name null parts instead of throwing in resultText - #360
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Fixes MCP resultText throwing on a null content part (returns [unknown]). Reviewed diff, validated in composed local build (tests green). CI approved.
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resultText cast each part to an object then read item.type. A null/undefined entry from a vendor MCP server threw TypeError (verified: resultText([null]) throws). Primitives were safe, null was not.
Fix returns [unknown] for non-object parts, consistent with the existing naming-not-dropping policy.
Tests: added null/undefined/number cases to server/tests/mcp-result.test.ts (10 pass). Biome clean.