Fix extension materialization to move bundles into container (#2339)

* Migrate extension plugin materialization layout

Materialize extension plugins into a dedicated extensions/ container, validate the new manifest convention, and bump extension plugin versions.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Keep extension manifests source-compatible

Restore source extension manifests to "extensions": "." while preserving materialization-time rewrite to "extensions" in distribution output.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Validate canvas extension layout for external submissions

Add intake and quality-gate checks for canvas-tagged external plugins so they must include extensions/extension.mjs and optional manifest extensions is validated when present.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Fix plugin clean extension pass and typo guard text

Declare EXTENSIONS_DIR in clean-materialized-plugins and run extension cleanup once after plugin cleanup. Also normalize misspelled-key detection strings to satisfy spelling checks without changing validation behavior.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Proper codespell fix

* Separate canvas structure quality gate status

Track canvas structure as its own gate status and output, include it in aggregate summaries, and enforce Git object types so extensions/ is a tree and extensions/extension.mjs is a blob.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Move extension bundles during materialization

Change extension-plugin materialization to move root bundle entries into extensions/ instead of copying them, and assert originals are removed in test coverage.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Nest materialized extension bundles by plugin name

Materialize extension plugins into extensions/<plugin-name>/... (moved entries) so resulting paths are duplicated by design, and bump extension plugin versions to the next patch release.

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Fix extension materialization publish and cleanup

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

* Preserve root extension logo asset

Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>

Copilot-Session: d26008fb-9928-4ba7-b7c8-36f35320f7c1

eng/generate-marketplace.mjs

@@ -62,6 +62,16 @@ function collectLocalPluginsFromRoot(rootDir, sourcePrefix, includeEntry = () =>
   return plugins;
 }
 
+function hasExtensionEntryPoint(extensionDir, extensionName) {
+  const candidateEntryPoints = [
+    path.join(extensionDir, "extension.mjs"),
+    path.join(extensionDir, "extensions", "extension.mjs"),
+    path.join(extensionDir, "extensions", extensionName, "extension.mjs"),
+  ];
+
+  return candidateEntryPoints.some((entryPointPath) => fs.existsSync(entryPointPath));
+}
+
 /**
  * Generate marketplace.json from plugin directories
  */
@@ -78,7 +88,7 @@ function generateMarketplace() {
     ...collectLocalPluginsFromRoot(
       EXTENSIONS_DIR,
       "extensions",
-      (entryName) => fs.existsSync(path.join(EXTENSIONS_DIR, entryName, "extension.mjs"))
+      (entryName) => hasExtensionEntryPoint(path.join(EXTENSIONS_DIR, entryName), entryName)
     )
   ];