ci: add release concurrency guards + document release gotchas #166

Job	Run time
nix-test (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/pythinker)	1m 28s
build (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/onefile/pythinker)	3m 25s
build (windows-2025-vs2026, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe, true)	4m 42s
test (3.13)	7m 15s
test (3.14)	6m 40s
nix-test (macos-14, aarch64-apple-darwin, dist/pythinker)	3m 33s
build (macos-14, aarch64-apple-darwin, dist/onefile/pythinker)	2m 27s
check	52s
build (ubuntu-22.04-arm, aarch64-unknown-linux-gnu, dist/onefile/pythinker)	3m 14s
test (3.12)	7m 20s
release-validate	9s
nix-test (ubuntu-22.04, x86_64-unknown-linux-gnu, dist/pythinker)	1m 54s
build (windows-2022, x86_64-pc-windows-msvc, dist/onefile/pythinker.exe)	4m 53s
	47m 52s

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