an IssueTracker implements an IssueTrackerProtocol (the minimal portable surface)
| from | to | to kind |
|---|---|---|
| issue-tracker:linear | issue-tracker-protocol:linear | IssueTrackerProtocol |
| issue-tracker:github-issues | issue-tracker-protocol:github | IssueTrackerProtocol |
| issue-tracker:jira | issue-tracker-protocol:jira | IssueTrackerProtocol |
| issue-tracker:asana | issue-tracker-protocol:minimal | IssueTrackerProtocol |