v4 T-4.9: model extdeps/languages/verilog.dag — HW concurrency as 5 behaviors (IN-B probe PASS)

[briansrls]

Summary

• IN-B probe RESULT: PASS — Verilog hardware concurrency models cleanly under the existing five L1 behaviors with NO 6th Concurrent behavior and NO core/pipeline change. The probe was authored to falsify the IN-B claim (concurrency = Bind composition + effect typing, no behavior extension); it surfaces the structurally-correct intra-vs-cross-program partition along the way — intra-program HW concurrency (parallel always-blocks within one module) is the Conj-of-parallel-siblings + Bind-chain shape with per-language effect-typing intrinsic to the wire/reg/vector signal type; cross-program coordination (Endpoint/DeploymentUnit/messaging) is a distinct concern owned by extdeps/coordination.dag (T-4.8).
• Declares the irreducible structural carrier: 7 closed-Disj coproducts (PortDirection, NetType, VariableType, EdgeTrigger, ProceduralAssignKind, PackingShape, ModuleItem — each with full 5-pattern Practice-4 ledger per modeling-discipline.md §4 binding, including Practice-7 Parameterized-family per PR v4 T-3: model std/cardinality.dag — descent-evidence carriers + multiplicity refinement #3163 precedent) + 13 Conj records (VectorRange and VerilogCost carry the 🟡 raw-Int scaffold bridge mirroring std/diagnostic.dag ByteRange + ptx Dim3).
• Deferred with named-owner+trigger (do not author, do not improvise): emit/parse ops ride D1 Outcome when ratified in std/diagnostic.dag; bit-vector inhabitance rides pending D2 instance-value form (PR T-4.12: model extdeps/languages/llvm_ir.dag — LLVM IR LanguageModel (B2-OMNI probe PASS) #3171 worker pushback precedent); recursive expression sub-grammar rides the T-4 LanguageModel bundle (verbatim String lexemes in the interim, spice.dag SpiceValue.lexeme precedent).
• Scaffold-header Consumes line preserved verbatim with surfaced staleness — primitive.dag deleted PR v4: decompose std/primitive.dag into six concept-anchored scalar files #3152; coordination.dag is an unfilled scaffold modeling a different concern. Pending the systemic per-file Consumes reconciliation (T-4 mgr synthesis msg_1fddb75c), uniform with ptx v4 T-4.14: model extdeps/languages/ptx.dag — SIMT-as-5-behaviors (B2-OMNI + IN-B probe, no STOP) #3170, spice v4 T-4.10: model extdeps/formats/spice.dag — Shape-B netlist (B2-OMNI probe ✓) #3168, llvm_ir T-4.12: model extdeps/languages/llvm_ir.dag — LLVM IR LanguageModel (B2-OMNI probe PASS) #3171.

The IN-B mapping (member-by-member) lives in the modeling-notes "IN-B PROBE FINDING" section: module body ↦ Conj of parallel siblings; continuous assign ↦ Transform; always-block ↦ bounded Loop step + boundary-driven iteration (per node.dag A2 footnote); procedural statement sequence ↦ Bind; if/case ↦ Branch; signal declaration ↦ effect-typed value; module instance ↦ structural Conj child.

Test plan

• v2-compiler compile --source-root src/v4 --target dag → 63 modules / 0 diagnostics
• Every coproduct ≥2 variants carries the full 5-pattern Practice-4 ledger with the "five patterns attempted" lead-in (Connective / Behavior / NodeKind / EdgeLabel / EdgeDiscipline / FreeMonoid / Ordering / spice Component / ptx StateSpace precedent)
• Scaffold-header Scope / Owns / Stress / Clear win lines preserved verbatim; staleness surfaced in Status, not silently rewritten (manager directive)
• No per-target algebra inhabitance instance-values declared (D2 deferred)
• No parse/emit function bodies declared (D1 Outcome deferred)
• No new files; no new std/ concepts; no hand-Rust

🤖 Generated with Claude Code

[briansrls]

Duplicate — dashboard-tracked PR is #3176 (same branch). Consolidating to that one.