8 tasks. Closes the prelude-decouple milestone by deleting
examples/prelude.ail.json and sweeping the surviving consumers + spec
text + inventory. Three production consumers retire: the migrate-bare-
cross-module-refs defensive include in ail/src/main.rs (with its
lockstep skip-branch), the cross-form-identity preflight test in
ailang-surface (its purpose discharged at pd.2-close), and one in-mod
test in core's workspace.rs (re-pointed from inline include_str! to
ailang_surface::parse_prelude via the dev-dep). Adds a carve-out
retirement pin asserting the JSON file does NOT exist. Updates
carve_out_inventory.rs (eight → seven; §C4(b) row dropped) and the
form-a-default-authoring spec §C4(b) (RETIRED status marker added,
historical text preserved).
Brummel
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