docs: use CNAME for Connect DNS configuration

[drernie]

Summary

• Replace the Route 53-specific alias A record instructions with a simple CNAME pointing to ConnectLoadBalancerDNSName
• CNAME works universally, including when Route 53 is in a different AWS account than the Quilt stack

Test plan

• Review docs render correctly

🤖 Generated with Claude Code

Greptile Summary

This PR simplifies the DNS configuration documentation for Quilt Connect Server by replacing the Route 53-specific alias A record setup (which required both ConnectLoadBalancerDNSName and ConnectLoadBalancerCanonicalHostedZoneID) with a single, universally compatible CNAME record pointing to ConnectLoadBalancerDNSName.

Key changes:

• Removes the Route 53-specific DNS table (record type A/alias, alias target, hosted zone ID fields)
• Replaces it with a concise prose instruction to create a CNAME pointing to ConnectLoadBalancerDNSName
• The ConnectHost output reference is preserved
• The simplification directly supports cross-account deployments where Route 53 may not be in the same AWS account as the Quilt stack

Confidence Score: 5/5

• This PR is safe to merge — it is a documentation-only change with no code impact.
• The change is purely documentation, technically accurate (CNAME to an ELB DNS name is valid for subdomains and works across all DNS providers), and the Connect subdomain pattern (<stack-name>-connect.<your-domain>) is always a subdomain, so the CNAME restriction on zone-apex records is not a concern here.
• No files require special attention.

Important Files Changed

Filename	Overview
docs/Catalog/Connect.md	Documentation-only change replacing the Route 53-specific alias A record DNS setup table with a concise CNAME instruction that works universally across DNS providers and AWS accounts.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["Deploy Quilt Stack\nwith ConnectAllowedHosts set"] --> B["CloudFormation Outputs Available:\n• ConnectLoadBalancerDNSName\n• ConnectHost"]
    B --> C["Create DNS CNAME Record\n(any DNS provider / any AWS account)"]
    C --> D["CNAME: <stack>-connect.<domain>\n→ ConnectLoadBalancerDNSName"]
    D --> E["Connect Server reachable at\nConnectHost URL"]
    E --> F["AI clients (Claude.ai, etc.)\ncan integrate via MCP"]

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_{Last reviewed commit: c3d6b50}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.32%. Comparing base (dd654ce) to head (a6c1959).

Additional details and impacted files

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##           master    #4750   +/-   ##
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  Coverage   44.32%   44.32%           
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  Files         813      813           
  Lines       32734    32734           
  Branches     5722     5722           
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  Hits        14509    14509           
  Misses      16221    16221           
  Partials     2004     2004           

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py-shared	98.18% <ø> (ø)

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[sir-sigurd]

1. I think alias is preferred when you use Route53, check that claim with AI if so let's mention both
2. maybe we should cross-reference with https://docs.quilt.bio/quilt-platform-administrator/installation#cnames?