Plan for iter 24.2. Tasks 1-2: preemptive 22b-Show → TShow/tshow
rename across 21 fixtures + 2 Rust test files (the recon-corrected
count vs spec's '~14' undercount). Task 3: insert 5 new top-level
defs (class Show + 4 primitive instances Int/Bool/Str/Float) at
prelude.ail.json:223 before fn ne. Task 4: mono-synthesis existence
test for show__T. Task 5: dispatch-singleton pin (show vs tshow,
both Step-2 singletons post-migration). Task 6: hash-stability pin
extension. Task 7: DESIGN.md §Prelude(built-in) classes amendment.
Task 8: integration + bench verification.
Recon-Boss reconciliation captured in Pre-flight notes: 21 fixtures
(not 14), prelude line 223 insertion point, str_clone-reachability
verified by Task 3 round-trip.
Brummel
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