fix: improve career break inference in stint changes

[skwowet]

Note

Medium Risk
Changes stint-splitting heuristics when inferring member org career breaks, which can alter generated/updated affiliation date ranges in production data. Logic is localized but affects core inference outcomes.

Overview
Adjusts career-break (stint split) detection in inferMemberOrganizationStintChanges when another organization overlaps the gap between dates.

Instead of always treating “umbrella” orgs (those that wrap the neighboring stint) as non-separators, they can now separate stints only if they occupy the gap for more than 90 days (vs the existing 30-day threshold for normal overlaps), and the overlap check is made explicit by early-returning when there is no positive overlap.

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[Copilot]

Pull request overview

Adjusts the stint-change inference logic used by the email-domain member-organization pipeline to better distinguish true career breaks from “umbrella” organizations that span neighboring stints, reducing false split/merge behavior.

Changes:

• Adds an early guard to ignore non-overlapping gap intersections (overlapStart >= overlapEnd).
• Changes “umbrella org” handling from “never a separator” to “separator only if it overlaps the gap for >90 days” (vs >30 days for non-umbrella orgs).

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