feat: gate heavy solver JSON, field traceability API, GUI rod/export depth

- C: emit profiles/diagnostics/fourier only when enable flags are set; null otherwise
- API: fieldTraceability on case parse/default and solve; fix GET /solve/default options
- Tests: golden fingerprint, quality gates, C diagnostics invariants; cardQa mean empty guard
- Makefile: test-solver-sanitize ASan/UBSan target; README and COMPUTE_PLAN updates
- GUI: taper weight/MTS/guides/sinker round-trip, rod catalog, solver output toggles,
  results (profiles/diagnostics/Fourier/traceability), engineering checks and tabs
- Restore canonical WellName in base-case for regression; trace TaperGuidesCountArray

Made-with: Cursor

README.md

@@ -1,4 +1,4 @@
-# Rods Cursor — Rod-string solver (math-first)
+# Majic Rod Solver — Rod-string solver stack (math-first)
 
 Deterministic **C** numerical core (FDM + FEA), **Node** API for XML and orchestration, **TypeScript** GUI for workflow. See **[AGENTS.md](AGENTS.md)** for agent rules and **[Agents/MATH_SPEC.md](Agents/MATH_SPEC.md)** for equations and paper citations.
 
@@ -107,7 +107,8 @@ make down
 ## Validation
 
 ```bash
-make test         # solver-api vitest + gui-ts tests + solver-c test_solver
+make test                # solver-api vitest + gui-ts tests + solver-c test_solver
+make test-solver-sanitize # optional: ASan/UBSan build of solver-c test harness
 ./solver-c/test_solver
 ```