Make session close synchronous and retry only connection-level termination failures

[Copilot]

• Review the last two commits and identify the affected runtime behavior
• Locate the most relevant docs for connection close and session cleanup behavior
• Document synchronous close semantics and the 3-attempt retry in JDBC configuration docs
• Document the same retry behavior in the eBook
• Validate the documentation changes and reply to the PR comment
• Run final review/security validation

[rrobetti]

@copilot document this behaviour including in the eBook but in other doc(s) if relevant. Make it clear that there is a retry.

[Copilot]

@copilot document this behaviour including in the eBook but in other doc(s) if relevant. Make it clear that there is a retry.

Documented in the eBook and the relevant docs. I updated the JDBC config guide, the session cleanup guide, and eBook Chapter 5 to make the synchronous close behavior and the 3-attempt connection-level retry explicit, including the non-retry cases. Commit: a318fd8

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud