chore(mint): strengthen mode regression coverage

[yordis]

• keep the Mint adapter regression net explicit after the passive-default fix changed the most failure-prone path
• make active and passive reused-connection expectations visible so future changes do not silently drop one side of the behavior matrix
• preserve confidence in follow-up Mint changes by asserting the closed-connection edge cases in one place

[cursor]

PR Summary

Low Risk
Test-only changes that expand coverage around Mint adapter modes and connection reuse, with no production logic changes. Low risk aside from potential CI flakiness if assumptions about Mint errors vary across environments.

Overview
Strengthens Mint adapter regression coverage by adding a full mode: :passive test matrix for body_as (:plain, :stream, :chunks).

Splits connection-reuse tests into active vs passive suites, adds a shared closed-connection error assertion, and refactors repeated request/reuse setup into helper functions to make the behavior matrix explicit.

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[Copilot]

Pull request overview

This PR strengthens regression coverage around Tesla’s Mint adapter connection mode handling, especially after recent changes to passive defaults, by making active vs passive behavior explicit in tests and expanding coverage for reused-connection edge cases.

Changes:

• Add explicit mode: :passive test coverage for body_as variants (:plain, :stream, :chunks).
• Split “reusing connection” coverage into separate “reusing active connection” and “reusing passive connection” describes.
• Refactor reused-connection assertions into helper functions to reduce duplication and centralize closed-connection expectations.

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[Copilot]

Pull request overview

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