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Refactor options (next wins)

Small wins

• “List + page” helper: generic wrapper for --max/--page + nextPageToken output.
• Standardize list headers: consistent column naming (ID/NAME/EMAIL/etc).
• “Output row” helpers: centralize sanitizeTab use for tabular output.

Medium wins

• Drive “export format” registry: single map for docs/sheets/slides format help + validation.
• Shared “service bootstrap” helpers: reduce per-command boilerplate for requireAccount + newXService.
• Test harness helpers: one fake Google API server util (Drive/Gmail/Calendar/Tasks) with common JSON assertions.

Bigger wins

• API client retry unification: one retry stack (transport vs explicit); delete the other; push logs behind --verbose.
• Command grouping / UX: consolidate “download/export” story; ensure help text + flags match across services.