fix(file-system): Reclaim orphaned in-progress requests on RQ recovery

[vdusek]

Summary

• When a process crashed after fetch_next_request but before mark_request_as_handled or reclaim_request, the request remained in persisted in_progress_requests and was silently skipped on restart
• Clear in_progress_requests during _discover_existing_requests so orphaned requests are retried
• Add unit test simulating the crash-recovery scenario

Test plan

• New test test_in_progress_requests_recovered_after_crash validates the fix
• All existing storage client tests pass
• Lint and type checks pass

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.31%. Comparing base (5b28f03) to head (580fde0).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1825      +/-   ##
==========================================
+ Coverage   92.25%   92.31%   +0.05%     
==========================================
  Files         157      157              
  Lines       10886    10889       +3     
==========================================
+ Hits        10043    10052       +9     
+ Misses        843      837       -6     

Flag	Coverage Δ
unit	92.31% <100.00%> (+0.05%)	⬆️

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[Mantisus]

LGTM