Two backend changes that unbreak the senior-pickup path from the
notification panel:
1. notification_service: session.escalated link template now ends with
?pickup=true so the senior lands in the handoff/pickup flow on
click. Without it, navigation hit /pilot/:id directly, which then
404'd on the GET because the senior isn't yet escalated_to_id —
the user perceives this as the bell-icon "just clearing the
notification".
2. ai_sessions GET access: any account member can now read an escalated
session's detail when status is requesting_escalation or escalated.
The owner-only guard was overly restrictive for explicitly-shared
in-transit states. Tenant boundary is enforced by RLS on the
underlying query, so account-scope is the right ceiling here. After
pickup, the existing handler/escalated_to_id checks still apply.
Verified live: re-login as the senior engineer and GET the active
escalated session — now returns 200 with full detail. Focused test
subset plus tests/test_sessions.py and tests/test_session_sharing.py
→ 94 passed in 43.26s, no regressions.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>