fix(core): preserve existing source properties in claude plugin config

[MaxKless]

Current Behavior

Running configure-ai-agents overwrites the entire source object in extraKnownMarketplaces['nx-claude-plugins'], removing any user-added properties like ref.

Expected Behavior

User-added source properties (e.g. ref) are preserved, while source and repo are always set to the correct values.

🤖 Generated with Claude Code

[netlify]

✅ Deploy Preview for nx-docs ready!

Name	Link
🔨 Latest commit	541ea8e
🔍 Latest deploy log	https://app.netlify.com/projects/nx-docs/deploys/699c327a5dee790008995819
😎 Deploy Preview	https://deploy-preview-34499--nx-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 541ea8e

Command	Status	Duration	Result
nx affected --targets=lint,test,test-kt,build,e...	✅ Succeeded	44m 33s	View ↗
nx run-many -t check-imports check-lock-files c...	✅ Succeeded	3m 14s	View ↗
nx-cloud record -- nx-cloud conformance:check	✅ Succeeded	8s	View ↗
nx-cloud record -- nx format:check	✅ Succeeded	2s	View ↗
nx-cloud record -- nx sync:check	✅ Succeeded	<1s	View ↗

---

☁️ Nx Cloud last updated this comment at 2026-02-23 11:46:03 UTC

[netlify]

✅ Deploy Preview for nx-dev ready!

Name	Link
🔨 Latest commit	541ea8e
🔍 Latest deploy log	https://app.netlify.com/projects/nx-dev/deploys/699c327a5dee79000899581b
😎 Deploy Preview	https://deploy-preview-34499--nx-dev.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[nx-cloud]

Important

At least one additional CI pipeline execution has run since the conclusion below was written and it may no longer be applicable.

Nx Cloud has identified a possible root cause for your failed CI:

Our analysis indicates this failure is due to an environment_state issue rather than the PR's code changes. The error "Gradle build daemon has been stopped: stop command received" occurred in the e2e-gradle project (not touched by this PR), while our changes only modify AI agent configuration logic in the nx package—there's no code path connecting these two areas.

No code changes were suggested for this issue.

🔂 A CI rerun has been triggered by adding an empty commit to this branch.

View detailed reasoning on Nx Cloud ↗

_{🎓 Learn more about Self-Healing CI on nx.dev}

[github-actions]

This pull request has already been merged/closed. If you experience issues related to these changes, please open a new issue referencing this pull request.