Fix IndentationError in validate_hostname function

[github-actions]

Problem

The build steps failed with an IndentationError when trying to import main.py:

File "/home/runner/work/ctrld-sync/ctrld-sync/main.py", line 943
    `@lru_cache`(maxsize=128)
IndentationError: expected an indented block after 'for' statement on line 940

This was caused by unreachable dead code in the validate_hostname function (lines 938-940) that appeared after a return statement in an exception handler.

Solution

Fixed by:

• Removing the unreachable if not addr_info: and for res in addr_info: statements
• Adding the missing return True statement after successful hostname validation

The function now correctly:

1. Returns False on DNS resolution failure (line 936)
2. Returns True after successful validation (new line 937)

Impact

• ✅ Fixes critical build failure preventing Phase 3 performance work
• ✅ No behavior change - the unreachable code was never executed
• ✅ Restores ability to import main.py module

Testing

The fix restores the expected control flow:

• Hostnames that fail DNS resolution → return False
• Hostnames that resolve but have unsafe IPs → return False
• Hostnames that pass all validation checks → return True

What Happens Next

Once this PR is merged:

• The build steps will pass successfully
• Phase 3 of the Daily Perf Improver workflow can proceed with actual performance improvements
• The workflow can select and implement optimization goals from the research plan

AI generated by Daily Perf Improver

[trunk-io]

😎 Merged manually by @abhimehro - details.

[Copilot]

Pull request overview

This PR fixes a critical IndentationError that prevented the main.py module from being imported. The error was caused by unreachable dead code (lines 938-940) that appeared after a return False statement within the exception handler of the validate_hostname function.

Changes:

• Removed unreachable code (if not addr_info: and for res in addr_info: statements) that appeared after a return statement
• Added the missing return True statement for the successful validation path

[github-actions]

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