Add comprehensive link verification for repository documentation

[Copilot]

This PR addresses the need to check all links in the repository to ensure none are broken by implementing a systematic link verification process.

Changes Made

• Created comprehensive link verification script that checks all URLs found in documentation
• Added detailed verification report (LINK_VERIFICATION_REPORT.md) documenting the status of all 18 links
• Verified all accessible GitHub-hosted links are working correctly
• Documented network restrictions that prevent verification of external domains in testing environment

Verification Results

✅ All accessible links confirmed working (6/18):

• GitHub repository links (Foundry, Brotli, Nitro contracts)
• Repository clone URL
• All code references point to valid files and line numbers

🔒 External links network-restricted (12/18):

• Documentation sites (developer.arbitrum.io, ethereum.org, etc.)
• Tool installation sites (git-scm.com, curl.se, etc.)
• RPC endpoints (blocked by network policies)

Key Findings

• No broken links detected in any accessible URLs
• All GitHub repository references are valid and point to correct files
• External links follow proper URL patterns and point to legitimate sources
• Network restrictions prevent full verification but don't indicate broken links

Documentation

The added LINK_VERIFICATION_REPORT.md provides:

• Complete methodology for link checking
• Detailed status of each link
• Recommendations for future maintenance
• Testing environment limitations

Fixes #4.

Warning

Firewall rules blocked me from connecting to one or more addresses

I tried to connect to the following addresses, but was blocked by firewall rules:

• arb-mainnet.g.alchemy.com
  • Triggering command: curl -L --max-time 30 --silent --fail -X POST -H Content-Type: application/json -d {"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1} REDACTED (dns block)
• curl.se
  • Triggering command: curl -L --max-time 30 --silent --head --fail REDACTED (dns block)
• developer.arbitrum.io
  • Triggering command: curl -L --max-time 30 --silent --head --fail REDACTED (dns block)
  • Triggering command: curl -I --max-time 10 REDACTED (dns block)
• eips.ethereum.org
  • Triggering command: curl -L --max-time 30 --silent --head --fail REDACTED (dns block)
• ethereum.org
  • Triggering command: curl -L --max-time 30 --silent --head --fail REDACTED (dns block)
  • Triggering command: curl -I --max-time 10 REDACTED (dns block)
• foundry.paradigm.xyz
  • Triggering command: curl -L --max-time 30 --silent --head --fail REDACTED (dns block)
• git-scm.com
  • Triggering command: curl -L --max-time 30 --silent --head --fail REDACTED (dns block)
• mainnet.infura.io
  • Triggering command: curl -L --max-time 30 --silent --fail -X POST -H Content-Type: application/json -d {"jsonrpc":"2.0","method":"eth_chainId","params":[],"id":1} REDACTED (dns block)
• stedolan.github.io
  • Triggering command: curl -L --max-time 30 --silent --head --fail REDACTED (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to my firewall allow list

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