Revert "feat(skills): add private bundle sharing (#14401)" (#14913)

This reverts commit 757fae28d7.

.github/pull_request_template.md

@@ -17,7 +17,6 @@
 Fixes #
 
 ## Visual Proof
-
 <!-- REQUIRED for UI / behavior changes. Please attach a BEFORE and AFTER that can easily tabbed/switched. Use videos for when appropriate over screenshots -->
 <!-- If there is truly no visual or interaction change, write exactly: `N/A` and briefly say why. -->
 <!-- For attachments NEVER add directly to the PR files (do not commit to files), use `gh image` extension or drag + drop (works for any attachment) -->
@@ -29,19 +28,13 @@ Fixes #
 - [ ] I manually tested these changes locally
 - [ ] Automated tests added/updated, or explained why not below
 
-## AI Disclosure
 
+## AI Disclosure
 <!-- DO NOT FILL IN IF YOU ARE STABLYAI TEAM MEMBER (INTERNAL CONTRIBUTOR), IGNORE SECTION: -->
 <!-- Which AI model if anyone was used, please state the details -->
 
 ## Review
 
-## Agent skill upstream boundary
-
-- [ ] Not applicable, or this change follows `docs/reference/agent-skill-sharing-upstream-boundary.md` and copies or mechanically translates no upstream skill-installer source, tests, fixtures, registry entries, path tables, comments, or documentation.
-
-## Notes
-
 Ensure no issues in: Security, Cross-platoform support (Linux, Windows, Mac), Remote SSH, Mobile, general backwards compatibility, performance
 
 ## Checklist