Add short CLI flag aliases, fix stake flags, and harden disk cache#4

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grubbhook wants to merge 5 commits intounconst:mainfrom

Commits on Mar 17, 2026

Update --hotkey → --hotkey-name in reg.sh and docs

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Commits on Mar 18, 2026

Add short flag aliases for global CLI args

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Fix false failure: switch wait_for_finalized_success → in-best-block poll

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Add -a/--amount and -u/--netuid short flags to stake subcommands

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Commits on Mar 19, 2026

Fix concurrent_writes_no_corruption: unique tmp file per write

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