Copy Planning Timeout

[lightsighter]

Summary

• Modified TransferDesc::perform_analysis to accept a TimeLimit parameter and return a bool indicating whether analysis completed (true) or timed out (false)
• Added incremental state members (analysis_init_done, analysis_field_idx, analysis_fld_start, analysis_fill_ofs, analysis_field_done) to TransferDesc so that a timed-out analysis can be resumed from where it left off without recomputing prior work
• Pre-loop initialization (profiling setup, fill data allocation, dimension ordering, field resizing) is guarded by analysis_init_done and only runs once across calls
• The main field loop checks work_until.is_expired() at each iteration, saving progress and returning false if the time limit is reached
• Both existing callsites updated: check_analysis_preconditions passes an unbounded TimeLimit(), and DeferredAnalysis::event_triggered forwards its work_until parameter (previously ignored per the // TODO: respect time limit comment)

[codecov]

Codecov Report

❌ Patch coverage is 82.45614% with 20 lines in your changes missing coverage. Please review.
✅ Project coverage is 29.32%. Comparing base (f337379) to head (6bfbeff).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
tests/unit_tests/perform_analysis_test.cc	83.05%	10 Missing ⚠️
src/realm/transfer/transfer.cc	83.33%	7 Missing and 2 partials ⚠️
src/realm/transfer/transfer.inl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #419      +/-   ##
==========================================
+ Coverage   29.07%   29.32%   +0.24%     
==========================================
  Files         194      195       +1     
  Lines       40229    40312      +83     
  Branches    14458    14493      +35     
==========================================
+ Hits        11697    11820     +123     
+ Misses      27598    27582      -16     
+ Partials      934      910      -24     

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