refactor(cms-base-layer)!: make the package a plain Nuxt layer

[Maciek Kucmus (mkucmus)]

Description

Makes @shopware/cms-base-layer a plain Nuxt layer. Closes #2163

• Removed the dead Nuxt module (src/index.ts, build.config.ts, index.cjs, dist). It registered a component folder that moved to app/ long ago, so it could not work.
• Dropped the build and dev scripts and the unbuild dev dependency. Nothing is left to bundle.
• Fixed files (listed helpers and app.config.ts that do not exist) and added an exports map.
• Deleted the stale components.d.ts and two vitest aliases pointing at missing files.
• types/imports.d.ts now uses the built @shopware/composables types instead of its sources.
• Updated README and AGENTS.md to match.

Breaking: the exports map blocks deep imports like @shopware/cms-base-layer/app/components/SwProductCard.vue, and index.cjs/dist are no longer published. Consume the package with extends: ["@shopware/cms-base-layer"].

Type of change

Breaking change (fix or feature that would cause existing functionality to not work as expected)

ToDo's

• Changeset file provided (major bump)
• Documentation added/updated

Additional context

Verified: layer tests/lint/typecheck, repo-wide typecheck (68 tasks), vue-demo-store vue-tsc and production build, CI build command, and npm pack diff vs main (only index.cjs leaves the tarball).

[Copilot]

Pull request overview

Refactors @shopware/cms-base-layer to reflect its real usage as a plain Nuxt layer (rather than a Nuxt module + build output), tightening the published surface via an exports map and removing dead build artifacts/config.

Changes:

• Removed the unused Nuxt module entry/build artifacts (src/index.ts, build.config.ts, index.cjs, stale types).
• Adjusted package publishing metadata (files, exports) and dropped unbuild usage for this package.
• Updated layer-local type shims and documentation to match layer consumption via extends.

Reviewed changes

Copilot reviewed 10 out of 13 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
pnpm-lock.yaml	Removes unbuild from the cms-base-layer importer after dropping the build step.
packages/cms-base-layer/vitest.config.ts	Removes vitest aliases that pointed to missing files.
packages/cms-base-layer/types/imports.d.ts	Updates #imports shim to re-export built composables types.
packages/cms-base-layer/tsconfig.json	Simplifies include/exclude for the layer-only TS program.
packages/cms-base-layer/src/index.ts	Deletes the dead Nuxt module implementation.
packages/cms-base-layer/README.md	Updates docs to reflect layer auto-import usage and blocked deep imports.
packages/cms-base-layer/package.json	Converts package metadata to a plain Nuxt layer (exports, files, scripts/deps cleanup).
packages/cms-base-layer/index.cjs	Removes the CommonJS proxy (no longer published/needed).
packages/cms-base-layer/components.d.ts	Removes stale global component typings at outdated paths.
packages/cms-base-layer/build.config.ts	Removes unbuild configuration now that nothing is bundled.
packages/cms-base-layer/AGENTS.md	Updates contributor guidance to reflect “no build step” layer reality.
AGENTS.md	Documents that Nuxt layers ship sources as-is and have no build step.
.changeset/tidy-carrots-shake.md	Adds a major changeset documenting the breaking packaging/import changes.

Files not reviewed (1)

• pnpm-lock.yaml: Generated file

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