feat: harden benchmark runs and stabilize TUI prompt bar #700

Job	Run time
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	3m 26s
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	2m 28s
check	47s
test (3.12)	10m 29s
release-validate	9s
test (3.14)	9m 26s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	1m 58s
test (3.13)	9m 45s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	3m 14s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 9s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	2m 15s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	4m 2s
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	2m 43s
	53m 51s

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