[WIP] initial fixpoint iteration #34803

Job	Run time
Determine changes	8s
mkdocs	2m 55s
pre-commit	50s
cargo fmt	19s
python package	1m 26s
benchmarks	4m 52s
cargo build (release)	5m 41s
cargo build (msrv)	4m 4s
cargo clippy	2m 36s
cargo fuzz	4m 28s
cargo shear	23s
cargo test (linux)	4m 51s
cargo test (wasm)	2m 9s
cargo test (windows)	10m 25s
formatter instabilities and black similarity	4m 13s
test scripts	1m 20s
test ruff-lsp	13s
ecosystem	14m 31s
Fuzz the parser	5m 26s
	1h 10m 50s

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