chore(state): linear-arrows enforced — update STATE.a2ml

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: hyperpolymath

.machine_readable/6a2/STATE.a2ml

@@ -6,6 +6,7 @@ project = "affinescript"
 version = "0.1.0"
 last-updated = "2026-04-11"
 status = "active"
+session-note-2026-04-11-c = "LINEAR ARROWS ENFORCED (commit d2f9b7b): (1) lambda synth — |@linear x: T| e now synthesises T -[1]-> U; (2) lambda check mode — explicit quantity annotation validated against expected TArrow; (3) quantity.ml ExprLambda — annotated params declared in env, usage verified, violations accumulated in env.errors and drained after check_function_quantities step 3; scope leakage prevented via quantities save/restore. Also fixed codegen.ml missing custom_sections field (pre-existing wasm.ml change). 75 tests, 0 regressions. NEXT: traits generic resolution → unification integration; then LSP Phase B."
 session-note-2026-04-11-b = "BUG-005 CLOSED: WasmGC silent drop+null fallbacks replaced with explicit CodegenError (UnboundFunction for missing func_indices entries, UnsupportedFeature for indirect/higher-order calls). Effects runtime SHIPPED: TopEffect now registers each op as a PerformEffect-raising VBuiltin in interp.ml (was no-op). Multi-arg handler arg_vals bug fixed. ExprResume wired to __resume__ continuation in handler env. WasmGC path: TopEffect ops registered as unreachable stubs with correct func_indices offsets; ExprHandle and ExprResume reject with UnsupportedFeature (EH proposal or CPS transform required for full dispatch)."
 
 [project-context]
@@ -42,7 +43,7 @@ test-files = 54
 # "declared-but-unwired" = surface syntax and/or internal module exists, but
 # the feature is not enforced on user programs through the CLI pipeline.
 affine-types = "wired-and-reachable (Track A Manhattan plan complete 2026-04-10. Quantity semiring in lib/quantity.ml; invoked from typecheck.ml:1206 inside the standard CLI pipeline. Surface syntax per ADR-007 hybrid: @linear/@erased/@unrestricted attributes (Option C primary) on let/stmt-let/param/lambda-param, AND :1/:0/:ω numeric sugar (Option B) on let/stmt-let. Scaled Let rule per ADR-002 implemented in lib/quantity.ml ExprLet/StmtLet — closes BUG-001 (ω-let smuggles linear values) and BUG-002 (zero-let erasure). Four regression fixtures in test/e2e/fixtures/ exercise both surface forms. Behavioural enforcement verified via E2E Quantity test suite — 4 new passing tests, 0 regressions.)"
-linear-arrows = "parse-only (-[q]-> syntax accepted by parser; quantity annotation not propagated into enforcement)"
+linear-arrows = "enforced (2026-04-11): Three-part fix landed. (1) typecheck.ml lambda synth: |@linear x: T| e now synthesises T -[1]-> U (was always QOmega). (2) typecheck.ml lambda check mode: explicit param quantity annotation validated against expected TArrow quantity; unannotated params inherit context quantity. (3) quantity.ml ExprLambda: added env.errors accumulator; annotated lambda params declared via env_declare so env_use tracks them; usage verified with check_quantity after body walk; violations pushed to env.errors and drained at end of check_function_quantities (step 4). Saved/restored env.quantities entries to prevent scope leakage. Two E2E fixtures + 2 passing tests. 75 tests total, 0 regressions. Commit d2f9b7b pushed."
 borrow-checker = "phase-3-in-progress (see lib/borrow.ml [IMPL-DEP: Phase 3])"
 row-polymorphism = "60% (records + effects rows implemented in typecheck/unify; not fully exercised end-to-end)"
 effects = "interpreter-complete (handler dispatch, PerformEffect propagation, ExprResume, multi-arg ops all wired in interp.ml 2026-04-11). WasmGC: ops registered as unreachable stubs; ExprHandle/ExprResume reject with UnsupportedFeature — full WASM dispatch needs EH proposal or CPS transform."