QA Journal: internal/usage Boundary Value Analysis

[theRebelliousNerd]

Added an organically written 400+ line journal entry in .quality_assurance/ evaluating the internal/usage tracking subsystem for missing boundary and negative edge cases (especially around map bounds, cross-process locks, string inputs, and NaN costs). Inserted corresponding // TODO: comments into internal/usage/usage_tracker_test.go.

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PR created automatically by Jules for task 15669466461328474113 started by @theRebelliousNerd

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