refactor(ui,kernels): Implement kernels plugin framework

[rifont]

Summary by CodeRabbit

• New Features

  • Promise-based Kernel client with lazy connect, event subscriptions (progress/telemetry/log/parameters), filesystem bridge and Node/in-memory/browser filesystem backends; in-process and worker transports.
  • Multi-bundler, extension-aware bundling; tessellation-aware render/export options.
  • Plugin factory presets for kernels, middleware, and bundlers; benchmarking and telemetry/OC tracing tooling.

• Refactor

  • Unified kernel options surface and client-centric render/export flow (simpler error propagation; removed legacy can-handle round-trip).

• Documentation

  • Extensive new docs: API, guides, concepts, best practices, middleware/bundler guides and examples.

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Note

Low Risk
Changes are limited to editor/automation configuration and planning markdown under .cursor/, with no impact on application/runtime code paths.

Overview
Adds/updates .cursor/ guidance and planning artifacts: expands the pr-issue-fixer agent prompt format, introduces multiple detailed kernel/filesystem architecture plan documents, and tweaks .cursor/mcp.json argument formatting.

No production source code changes are included in this diff; it’s primarily documentation/configuration for tooling and internal planning.

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