Consume ai-title from external sessions and add end marker

[alexsong-oai]

Summary

• Support Claude Code ai-title / aiTitle records when detecting and importing external agent sessions.
• Preserve existing custom-title / customTitle precedence; only fall back to aiTitle when no custom title is present.
• Add coverage for both detection and import title selection, including the custom-title-over-ai-title case.

Testing

• cargo test -p codex-external-agent-sessions
• just fix -p codex-external-agent-sessions

[alexsong-oai]

@codex review

[chatgpt-codex-connector]

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

View security finding report

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[alexsong-oai]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. 👍

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