Fix isActive check in probe history map

[macrat]

Summary

• avoid panic when checking if a target history is active
• add unit test covering missing target case

Testing

• go test ./internal/store -run ProbeHistoryMap_isActive -count=1

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PR made by Codex

[Copilot]

Pull Request Overview

This PR fixes a panic in the probe history map by updating the isActive function to safely handle absent targets, and it adds a unit test to verify this behavior.

• Update isActive to safely check for target presence before evaluation
• Add unit test to cover the case when a target is missing

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
internal/store/probehistory_internal_test.go	Added a unit test to ensure isActive behaves correctly on empty map
internal/store/probehistory.go	Updated isActive to prevent a panic when the target is not found

Comments suppressed due to low confidence (1)

internal/store/probehistory.go:103

• [nitpick] Consider updating the isActive function comment for clarity. A suggested update: 'isActive returns whether the specified target is active in the current execution.'

// isActive returns if is the specified target active in current execution or not.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.79%. Comparing base (92c47cc) to head (33ccb26).

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Additional details and impacted files

@@           Coverage Diff           @@
##            v0.17      #23   +/-   ##
=======================================
  Coverage   87.78%   87.79%           
=======================================
  Files          74       74           
  Lines        6460     6463    +3     
=======================================
+ Hits         5671     5674    +3     
  Misses        648      648           
  Partials      141      141           

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