Classify sandbox execution failures on execute spans

[RhysSullivan]

Sandbox script failures ride the MCP success channel as ExecuteResult.error, so mcp.execute spans read OK and the failure class is unqueryable — over the last 7 days zero spans carried a wrong-shape TypeError signature despite ~97k executions.

• @executor-js/codemode-core: adds ExecuteErrorKind and an optional errorKind on ExecuteResult, classified from the thrown error's name (never message content).
• dynamic-worker runtime: tags the tool-dispatch rethrow (ExecutionToolError) and in-sandbox deadline (ExecutionTimeoutError) with dedicated names, populates errorKind from the serialized error, and maps its typed failures (compile → syntax_error, runtime → serialization_error/resource_limit, host timeout → timeout).
• execution engine: annotates mcp.execute / mcp.execute.resume spans with mcp.execute.outcome (ok/fail/paused) and mcp.execute.error_kind on failures.
• prod-telemetry skill doc updated with the new attributes.

Error messages shown to the model are unchanged; only error names inside the sandbox differ (ExecutionToolError/ExecutionTimeoutError instead of Error).

Gives prod a queryable baseline for wrong-shape response guesses (error_kind=type_error) ahead of the inferred output-shape work.

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commit: b0c2f86