chore: harden the extension API before it ships #813

Job	Run time
build / lint-python	12s
build / generate-license	50s
build / lint-toml	5s
build / lint-rust	34s
build / check-crates-patch	-1s
build / Linux x86_64 (3.14t)	11m 44s
build / Linux arm64 (3.14t)	9m 36s
build / Linux x86_64 (abi3)	18m 58s
build / Linux arm64 (abi3)	9m 56s
build / macOS arm64 (3.14t)	9m 53s
build / Windows x86_64 (3.14t)	4m 4s
build / macOS arm64 (abi3)	7m 6s
build / Windows x86_64 (abi3)	10m 4s
build / Source distribution	-1s
build / macOS x86_64 (${{ matrix.python-tag }})	-1s
build / Build docs	1m 27s
build / Merge build artifacts	-1s
test / test-matrix (3.12, abi3, false)	4m 1s
test / test-matrix (3.11, abi3, false)	4m 31s
test / test-matrix (3.10, abi3, false)	4m 9s
test / test-matrix (3.13, abi3, false)	4m 27s
test / test-matrix (3.14t, 3.14t, true)	1m 1s
test / test-matrix (3.14, abi3, false)	4m 43s
	1h 47m 17s

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