iter mq.1: class-ref canonical-form extension + workspace-internal class-name qualification

Three schema fields move bare → canonical (bare for same-module,
<module>.<Class> for cross-module): InstanceDef.class,
Constraint.class, SuperclassRef.class. Symmetric to ct.1's
Type::Con.name rule. ClassDef.name stays bare.

validate_canonical_type_names gains three field-walks via new
check_class_ref helper + two sibling diagnostics
BareCrossModuleClassRef / BadCrossModuleClassRef.
check_class_name_fields narrowed to ClassDef.name-only.

Workspace-internal class-name keys all qualified:
class_def_module, class_by_name, registry entries.0,
ClassMethodEntry.class_name, class_superclasses, mono's
class_index, Origin::Class.class_name. New qualify_class_ref
helper at workspace.rs scope plus sibling
qualify_class_ref_in_check in ailang-check.

Two new positive on-disk fixtures (mq1_xmod_constraint_class{,_dep})
exercise the qualified Constraint.class shape.

Recon claim that all existing fixtures' class-refs are intra-module
was empirically wrong — 10 fixtures required minimal canonical-form
migration. Duplicate-instance test architecturally restructured:
post-mq.1 orphan-freedom makes two-modules-on-same-(class,type)
structurally impossible; new test_22b1_dup_same_module fixture
lands both instances in the class's module.

Plan defects fixed inline: Origin::Class.class_name single
construction site (plan recon off-by-one); build_class_index in
mono.rs needed qualifying; build_module_globals needed Def::Instance
carve-out; check_fn declared-constraint matching needed inline
canonical-form lifting; NoInstance Float-aware message arm needed
prelude.Eq/prelude.Ord match; coherence type-leg needed qualified-
head split-and-lookup. Tasks 3-6 ran as one coherent fix.

7/7 tasks, 520 tests green. bench/compile_check.py + cross_lang.py
exit 0; bench/check.py exit 1 (4 improvements-beyond-tolerance,
audit-ratifiable, not a regression).

MethodNameCollision + dispatch path unchanged; iters mq.2 + mq.3
land them.

docs/journals/INDEX.md

@@ -42,3 +42,4 @@
 - 2026-05-12 — iter ctt.3: `KindMismatch` retire — pure deletion across 3 files (workspace.rs: variant + dispatch + helper + "dead-but-defensive" doc; main.rs: Display arm; lib.rs: 22b.1 archaeology comment). Existing test `class_param_in_applied_position_fires_canonical_form_rejection` stays green unchanged (asserts `BareCrossModuleTypeRef` on the malformed fixture — the canonical-form-validator successor path). Two adjacent textual-consistency edits ride along (validate_classdefs doc-comment "Three → Two", lib.rs archaeology comment gains a ctt.3 retirement marker). One mid-deletion mechanical fix: dispatch-loop deletion orphaned `mod_name` binding → rewrote `for (mod_name, m) in modules` to `for m in modules.values()` (same body type, mechanical). 2/2 tasks, ~600 tests green across 16 binary-test suites → 2026-05-12-iter-ctt.3.md
 - 2026-05-12 — audit-ct-tidy: milestone close (ct-tidy) — architect drift fixed inline as `ctt.tidy` (3 doc-side edits: DESIGN.md §"Class-schema diagnostics" drops the retired `KindMismatch` bullet + adds successor paragraph naming `BareCrossModuleTypeRef`; DESIGN.md §"Higher-kinded class params" rewritten to name `BareCrossModuleTypeRef` from canonical-form validation instead; roadmap.md two P2 todos struck `[x]` with forward-reference to ctt.3 and ctt.2). Bench mixed (check.py exit 1: bump_s persistence on `bench_list_sum` second consecutive sighting at +12.23% → +12.60%; two new first-sighting rc-cohort max_us latency regressions classified as noise pending next audit; the recurring 3-audit `latency.explicit_at_rc` improvement cluster narrowed to within tolerance this audit, withdrawing the ratify-pending plan from audit-eob — the meaningful shrinkage is itself attribution evidence that the cluster is noise-class not signal-class), baseline pristine for the 4th consecutive audit → 2026-05-12-audit-ct-tidy.md
 - 2026-05-12 — iter 24.1: `bool_to_str` + `str_clone` runtime + codegen wiring — 2 new C functions in `runtime/str.c` (slab-allocating heap-Str primitives via existing `str_alloc`), lockstep checker + synth.rs installs with `ret_mode: Own`, 2 IR-header declares + 2 `lower_app` arms + `is_static_callee` whitelist extension, 5 IR snapshots regen (2 declares × 5 files), 9 new tests (2 builtins-install unit + 2 IR-shape pin + 5 E2E all green), pre-existing-drift fix included (int_to_str row added to `builtins.rs::list()`). One substantive deviation: builtin-signatures registered in `uniqueness.rs::infer_module` + `linearity.rs::check_module_with_visible` (8 LOC × 2 files) so `str_clone`'s `param_modes: [Borrow]` is visible to the App-arg walker; symmetric to 23.4-prep's class-method registration; necessary for the plan's literal `frees == 3` cross-realisation assertion. Full `cargo test --workspace` 513 passed, 0 failed. `bench/compile_check.py` + `bench/cross_lang.py` green → 2026-05-12-iter-24.1.md
+- 2026-05-13 — iter mq.1: class-ref canonical-form extension + workspace-internal class-name qualification — three schema fields (`InstanceDef.class`, `Constraint.class`, `SuperclassRef.class`) move bare → canonical (bare for same-module, `<module>.<Class>` for cross-module) symmetric to ct.1's `Type::Con.name` rule; `ClassDef.name` stays bare (defining site, like `TypeDef.name`). `validate_canonical_type_names` gains three field-walks via new `check_class_ref` helper plus two sibling diagnostics `BareCrossModuleClassRef` / `BadCrossModuleClassRef`; `check_class_name_fields` narrowed to `ClassDef.name`-only. Workspace-internal class-name keys all qualified: `class_def_module`, `class_by_name`, registry `entries.0`, `ClassMethodEntry.class_name`, `class_superclasses`, mono's `class_index`, `Origin::Class.class_name`. New `qualify_class_ref` helper in `workspace.rs` plus sibling `qualify_class_ref_in_check` in `ailang-check`. Two new positive on-disk fixtures (`mq1_xmod_constraint_class{,_dep}`). Recon claim that all existing fixtures' class-refs are intra-module was empirically wrong — 5 test_22b* (`orphan_third`, `dup_a/b/entry`, `unbound_constraint_var`) + 5 other (`eq_ord_polymorphic`, `eq_ord_user_adt`, `cmp_max_smoke`, `ctt2_collision_{lib,main}`) fixtures required minimal canonical-form migration. Duplicate-instance test architecturally restructured: post-mq.1 orphan-freedom makes two-modules-on-same-`(class, type)` structurally impossible (any second instance in a non-owning module fires `OrphanInstance` first); new `test_22b1_dup_same_module.ail.json` lands both instances in the class's module — the only post-mq.1 way to land two on the same canonical key. Plan defects fixed inline: `Origin::Class.class_name` had one construction site not two (plan recon off-by-one); `build_class_index` in `mono.rs` needed qualifying (plan said "no code change needed"); `build_module_globals` needed a `Def::Instance` carve-out for qualified `inst.class`; `check_fn`'s declared-constraint matching needed inline canonical-form lifting; `NoInstance` Float-aware message arm needed `prelude.Eq`/`prelude.Ord` match; coherence type-leg needed qualified-head split-and-lookup. Tasks 3-6 ran as one coherent fix (Task 3 alone left tests RED). 7/7 tasks, 520 tests green, `bench/compile_check.py` + `bench/cross_lang.py` exit 0; `bench/check.py` exit 1 due to 4 improvements-beyond-tolerance (audit-ratifiable per convention, not a regression). `MethodNameCollision` + dispatch path unchanged; iters mq.2 + mq.3 land them → 2026-05-13-iter-mq.1.md