fix: support force flag for remove

[timvw]

Summary

• wire wt remove --force through to git worktree remove --force
• add test covering forced removal of dirty worktree

Testing

• go test ./...

[codecov]

Codecov Report

❌ Patch coverage is 16.66667% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 20.17%. Comparing base (8ea5ef6) to head (390c87c).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
main.go	16.66%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
- Coverage   20.17%   20.17%   -0.01%     
==========================================
  Files           1        1              
  Lines         461      466       +5     
==========================================
+ Hits           93       94       +1     
- Misses        362      366       +4     
  Partials        6        6              

Files with missing lines	Coverage Δ
main.go	20.17% <16.66%> (-0.01%)	⬇️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.