fix(shortcut): address Attendance and Mail review findings

.changes/1045-attendance-mail-shortcuts.md

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+---
+category: Changed
+---
+
+- **Attendance and Mail Shortcuts** (#1045) — publishes only capabilities with
+  strict response, identity, pagination, and real-data verification while
+  retaining historical CLI discovery and argument compatibility for commands
+  that remain unavailable to agents. Mailbox auto-resolution now accepts both
+  reviewed string and object response shapes, and Attendance date ranges cover
+  the complete requested end date without dropping cross-midnight punches whose
+  actual check time is inside the requested range.