test(coat-338) B2: merge master into feature (base-branch sync)

[anto-deepsource]

Fresh attempt for coat #338 verification. Preserved truthy case (P2 on master). See coat #338.

[deepsource-development]

DeepSource Code Review

We reviewed changes in 9d1323c...ce6a120 on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

See full review on DeepSource ↗

PR Report Card

Overall Grade

Security   Reliability   Complexity   Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Python		May 26, 2026 9:02a.m.	Review ↗
Secrets		May 26, 2026 9:02a.m.	Review ↗

[deepsource-development]

`sum` redefined as variable disables builtin `sum()`

The variable sum is assigned a value, which overwrites the builtin sum() function in this scope. This causes any call to sum() here to fail or behave unexpectedly, potentially leading to bugs.

Rename the variable to a non-builtin name like total_sum or accumulator to preserve access to the builtin sum() function and avoid confusion.