fix: Adding Floor to idle_time

[Ma77Ball]

What changes were proposed in this PR?

• idle_time was computed as total_execution_time - data_processing_time - control_processing_time, with no lower bound — timing races could make it negative and propagate bad values to the dashboard
• Added drift detection warning in update_total_execution_time when the new total is less than the accumulated processing time
• Added monotonicity check in update_total_execution_time to catch non-increasing timestamps
• get_statistics() clamps idle_time to 0 via max(0, ...)

Any related issues, documentation, or discussions?

closes: #4892

How was this PR tested?

• Updated TestStatisticsManagerExecutionTime to assert idle_time == 0 for the overshoot case instead of -30
• Removed the xfail marker that was tracking the unfixed bug

Was this PR authored or co-authored using generative AI tooling?

Co-Authored with Claude Opus 4.6 in Compliance with ASF

[Yicong-Huang]

LGTM. Thanks for the fix!

[Ma77Ball]

@Yicong-Huang, can you approve the two missing CI checks?

[Yicong-Huang]

@Yicong-Huang, can you approve the two missing CI checks?

Let me see if I can make a command similar to /take to do this. it might have some security concerns. I will research about it.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.16%. Comparing base (c533305) to head (0f258c7).

Files with missing lines	Patch %	Lines
...n/core/architecture/managers/statistics_manager.py	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #4900   +/-   ##
=========================================
  Coverage     42.15%   42.16%           
  Complexity     2179     2179           
=========================================
  Files           980      980           
  Lines         36298    36305    +7     
  Branches       3783     3783           
=========================================
+ Hits          15303    15308    +5     
- Misses        20066    20068    +2     
  Partials        929      929           

Flag	Coverage Δ
python	87.38% <75.00%> (-0.03%)	⬇️

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