v0.7.4

Added

• Change-gated recurrence visibility in Slack: a recurring incident resurfaces in
  the channel only when a re-fire is a real-world change (severity rise, a new
  symptom, or accelerating cadence) or crosses a milestone (×5/×10/×25/×50/×100,
  then every ×100), each stating why it resurfaced. Plain re-fires stay silent —
  the card's occurrence count edits in place. An escalation now edits the
  incident's existing card instead of posting a new one, so the whole recurrence
  reads as one thread. New notify.slack.recurrence_mode: change-gated | off.

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Full Changelog: v0.7.3...v0.7.4