fix(types) Eliminate runtime dependency on ConfigDict

[tony]

Summary

• Guard every ConfigDict import behind TYPE_CHECKING so production installs no longer require typing-extensions at runtime while keeping the same annotations for tooling.
• Update tests/cli/test_status.py fixtures to keep using the shared ConfigDict alias without violating the new guard pattern.
• Document the bug fix in CHANGES so downstream users know why the import order changed.

Testing

• uv run ruff check . --fix --show-fixes
• uv run ruff format .
• uv run mypy
• uv run py.test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.08%. Comparing base (361bf39) to head (194e854).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #476      +/-   ##
==========================================
- Coverage   79.10%   79.08%   -0.03%     
==========================================
  Files          14       14              
  Lines        1527     1525       -2     
  Branches      321      321              
==========================================
- Hits         1208     1206       -2     
  Misses        201      201              
  Partials      118      118              

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