fix: add timeout to registry validation to prevent indefinite hanging

[ryan-the-zilla]

What this PR does

Fixes #2027 - CLI hangs indefinitely when --registry-url points to an unreachable host.

Changes Made:

• Added AbortController with 10 second timeout to prevent indefinite hanging
• Changed HTTP method from GET to HEAD for lightweight validation
• Improved error messages to distinguish between timeout and network errors
• Properly clears timeout to avoid memory leaks

Testing:

• Manual testing with unreachable URLs (blackholed IPs)
• Verified timeout triggers correctly after 10 seconds
• Confirmed proper error messages are shown

Related Issue:

Part of Bounty Program 2026-04 (#2039)

Wallet for Bounty:

AqE264DnKyJci9kV4t3eYhDtFB3H88HQusWtH5odSqHM

[changeset-bot]

⚠️ No Changeset found

Latest commit: caac381

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud