fix: high-priority DX improvements from dogfood feedback (#168) #28

Job	Run time
build (macos-latest, x86_64-apple-darwin, specsync-macos-x86_64)	2m 6s
build (ubuntu-latest, aarch64-unknown-linux-gnu, specsync-linux-aarch64)	2m 2s
build (ubuntu-latest, x86_64-unknown-linux-gnu, specsync-linux-x86_64)	1m 25s
build (macos-latest, aarch64-apple-darwin, specsync-macos-aarch64)	1m 35s
build (windows-latest, x86_64-pc-windows-msvc, specsync-windows-x86_64.exe)	3m 46s
release	7s
	11m 1s

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