test(python): release auth callbacks on unsubscribe

[swkeever]

Unsubscribing from auth state must release the callback even while the subscription handle remains alive. This test pins that resource-cleanup guarantee and catches Mutmut's no-removal and wrong-key variants, which previously timed out in the full mutation gate.

Validation: poe checks passed (2,209 tests; 100% line and branch coverage; package and type checks). A fresh exact Mutmut run killed both affected mutants (2/2, no timeouts). The PR's mutation gate exercises the repository's required module set.

[swkeever]

@codex review

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-24T12:18:25.825228Z	37baae1	Manual request
🔒 Security Review	✅ Completed 2026-09-24T12:18:36.255805Z	37baae1	Manual request

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[chatgpt-codex-connector]

Codex Review: Something went wrong. Try again later by commenting “@codex review”.

Provided git ref 37baae19260810506ce42ec2e294110b943b7729 does not exist

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[swkeever]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

Reviewed commit: 37baae1926

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[chatgpt-codex-connector]

🛡️ Codex Security Review · Automatically triggered

Security review completed. No security issues were found in this pull request.

Reviewed commit: 37baae1926

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