chore: appease CI checks (schemas reset, prettierignore for .mjs assets)

Three fixes for CI failures on the open PR:

- schemas/agentcore.schema.v1.json: revert to origin/main. The CI gate
  rejects any change to this file because it is regenerated and
  released automatically — my rebase had carried my staged version.
- .prettierignore: add `src/assets/**/*.mjs`. The new Node interceptor
  templates ship as raw .mjs that's vended to users; we shouldn't
  reformat them via prettier on the way in.
- npm-shrinkwrap.json: revert to origin/main. My local `npm install`
  during the rebase produced a different ordering than what's on
  upstream — keeping upstream's authoritative version avoids drift.

Author: aidandaly24

.prettierignore

@@ -3,4 +3,5 @@ src/assets/**/*.md
 .github/scripts/prompts/
 src/assets/**/*.ts
 src/assets/**/*.json
+src/assets/**/*.mjs
 src/assets/**/*.template