Mastra 1.58.0 runs Code Mode in an in-process QuickJS WASM runtime, dropping the native addon and sandbox requirement

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Mastra's 2026-08-12 core release adds `@mastra/quickjs`, a transport that executes model-authored programs inside an in-process QuickJS WASM runtime with no native addon and no `--no-node-snapshot` flag — making Code Mode (write-a-program-that-calls-tools, versus one tool call per turn) deployable on serverless hosts that couldn't host a full sandbox. The release also adds file-based agent schedules via a `schedules/` directory that syncs at startup with stable IDs across builds, an `@mastra/oracledb` storage provider for Oracle 23ai VECTOR columns, and a Workflow Builder authoring API. Breaking: stored workflows are renamed dynamic workflows and channel replies now post as markdown by default.