Adds the six IR-shape tests in crates/ail/tests/e2e.rs to Task 5's
file list and documents the test-harness patch (replace home-rolled
desugar+lift loop with monomorphise_workspace). The patch is the
small structural fix the rpe.1 BLOCKED orchestrator's Cat B
findings pointed to. With the two upstream codegen bugs now fixed
(commits 1fb225e + feb9413), the rpe.1 corpus migration plus this
Cat B harness patch should make the full retry green.
Brummel
8b455bee4c