add a session lookup and point the pre-PR reminders at it

[tulioz]

agents kept resubmitting branches that already had a session because nothing could tell them, and duplicates on one branch break pr auto-linking

[aviator-app]

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[aviator-app]

🔃 FlexReview Status

Common Owner: aviator-co/engineering (expert-load-balance assignment)
Owner and Assignment:

• 🔒 aviator-co/engineering (expert-load-balance assignment)
  • Slack: #fr-eng-notifications
  • Assigned: davi-maciel
  Owned Files

  • 🔒 CLAUDE.md
  • 🔒 README.md
  • 🔒 cmd/aviator/main.go
  • 🔒 cmd/aviator/sessions.go
  • 🔒 cmd/aviator/sessions_test.go
  • 🔒 cmd/aviator/verify.go
  • 🔒 internal/adapter/reminder.go
  • 🔒 internal/adapter/reminder_test.go
  • 🔒 internal/api/client.go
  • 🔒 internal/api/client_test.go
  • 🔒 internal/api/runbook_list.go
  • 🔒 internal/api/runbook_list_test.go
  • 🔒 internal/api/verify.go

Review SLO: 7 business hours if PR size is <= 200 LOC for the first response.
❕ This PR modifies 817 lines, which is larger than the Review SLO threshold.