When auto-importing issues from JSONL, issues with different prefixes
(e.g., gt-1 vs gastown-) would fail validation and cause an infinite
loop of failed migrations.
The fix adds SkipPrefixValidation option to CreateIssuesWithFullOptions
which propagates through EnsureIDs to skip prefix validation for issues
that already have IDs during import. This allows importing issues with
any prefix while still validating new issues created interactively.
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Co-Authored-By: Claude <noreply@anthropic.com>
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