Only treat issue IDs as hierarchical (parent.child) when the dot appears
AFTER the first hyphen. This prevents false positives when the project
directory name contains a dot (e.g., "my.project-abc123" was incorrectly
being treated as having parent "my").
Fixes GH#508
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>