chore: resolve open dependabot security alerts

[jonathannorris]

Summary

• Bumped idna 3.13 -> 3.16 via uv lock --upgrade-package idna to resolve a medium-severity transitive vulnerability

Dependabot Alerts Resolved

Alert	Package	Severity	Fix
#33	idna	medium	Specially crafted inputs to idna.encode() can bypass the CVE-2024-3651 fix; bumped to 3.16 in uv.lock

idna is a transitive dependency. The upgrade is a single-package bump in uv.lock with no manifest changes required.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.20%. Comparing base (daafd73) to head (8bbd88b).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #394   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files          47       47           
  Lines        1741     1741           
=======================================
  Hits         1675     1675           
  Misses         66       66           

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[gemini-code-assist]

Code Review

This pull request updates the idna package version from 3.13 to 3.16 in the uv.lock file. I have no feedback to provide.