Move restricted template rendering to plugin window

[jackkav]

Summary

• route restricted template rendering through the plugin window bridge with a new plugins.renderTemplate IPC method
• rehydrate render context and preserve rich render error metadata across the plugin-window boundary
• remove the obsolete renderer worker templating entrypoints and update the blocker 2 notes/tests

Why

This finishes blocker 2 by ensuring template tag extensions no longer execute inside a renderer-owned web worker. Restricted template rendering now runs alongside the rest of the plugin surfaces in the plugin window.

[Copilot]

Pull request overview

This PR completes “blocker #2” of the nodeIntegration migration by moving restricted Nunjucks template rendering (including template-tag extensions) out of the main renderer’s Web Worker and into the hidden plugin window, accessed via a new plugins.renderTemplate bridge method.

Changes:

• Add plugins.renderTemplate to the plugin bridge and route restricted template rendering through the plugin window.
• Introduce render-context serialization/rehydration and error (de)serialization across the plugin-window boundary.
• Remove legacy renderer Web Worker templating entrypoints and update related docs/tests.

Reviewed changes

Copilot reviewed 15 out of 15 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
packages/insomnia/src/ui/worker/templating-worker.ts	Removes the renderer-owned templating Web Worker.
packages/insomnia/src/ui/worker/templating-handler.ts	Switches template rendering to plugins.renderTemplate and adds context/error normalization helpers.
packages/insomnia/src/templating/worker.ts	Deletes the old worker-side Nunjucks pipeline implementation.
packages/insomnia/src/templating/base-extension-worker.ts	Updates templating import path (worker-side extension helper).
packages/insomnia/src/plugins/renderer-bridge.ts	Exposes renderTemplate on the renderer bridge API.
packages/insomnia/src/plugins/invoke-method.ts	Adds renderTemplate handler and rehydrates serialized render context in the plugin window; reload now also resets templating cache.
packages/insomnia/src/plugins/bridge-types.ts	Adds IPC types for serialized render context and RenderTemplateArgs.
packages/insomnia/src/plugins/tests/invoke-method.test.ts	Adds test coverage for render-context rehydration.
packages/insomnia/src/main/plugin-window.ts	Adds plugins.renderTemplate IPC handler; improves error normalization from plugin window results.
packages/insomnia/src/entry.preload.ts	Exposes window.main.plugins.renderTemplate from preload via invokeWithNormalizedError.
packages/insomnia/src/entry.plugin-window.ts	Serializes errors across the plugin-window → main boundary with richer metadata.
packages/insomnia/src/entry.plugin-window-preload.ts	Adds minimal window.main APIs needed by plugin-window execution.
packages/insomnia/PLUGIN_SYSTEM_POC.md	Updates blocker notes to reflect the new plugin-window templating architecture.
packages/insomnia/NODE_INTEGRATION_MIGRATION_PR_PLAN.md	Refreshes the migration plan to reflect current codebase status.
AGENTS.md	Updates contributor guidance formatting and worktree setup notes.

Comments suppressed due to low confidence (1)

packages/insomnia/src/ui/worker/templating-handler.ts:12

• serializeRenderContext() currently spreads the full BaseRenderContext into the IPC payload. BaseRenderContext includes function properties (getMeta/getKeysContext/etc), and Electron IPC (structured clone) cannot serialize functions, so this call will fail at runtime when invoking plugins.renderTemplate. Build the serialized context by omitting all function-valued properties (or explicitly picking only data keys) before sending it over IPC.

function serializeRenderContext(context: RenderInputType['context']): RenderTemplateArgs['context'] {
  return {
    ...context,
    serializedFunctions: {
      requestId: context.getMeta().requestId,
      workspaceId: context.getMeta().workspaceId,

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