feat: release structured logging and opt-in auto-retries

[mogita]

Release PR: stamps the accumulated [Unreleased] changelog as v4.2.0; on merge the release workflow bumps the version, tags, and publishes.

Minor bump: the changelog records no breaking changes. Ships structured logging (opt-in logger + body logging, always-on secret redaction) and opt-in auto-retries via RetryConfig, plus the other accumulated unreleased changes. (Heads-up: the client request_timeout default moved 6s to 30s, classified non-breaking.)

Summary by CodeRabbit

• Documentation
  • Added a changelog entry for the 4.2.0 release dated July 24, 2026.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: b069622a-2627-4ff2-9628-5488686f6800

📥 Commits

Reviewing files that changed from the base of the PR and between 6e3c162 and 2949bde.

📒 Files selected for processing (1)

• CHANGELOG.md

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📝 Walkthrough

Walkthrough

Changes

Release documentation

Layer / File(s)	Summary
Add 4.2.0 release heading CHANGELOG.md	Adds the 4.2.0 release heading dated 2026-07-24 beneath [Unreleased].

Estimated code review effort: 1 (Trivial) | ~2 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title is concise and describes major changes in the release, especially structured logging and opt-in retries.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch release/logging-and-retry

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