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

data/cases/base-case.xml

@@ -15,7 +15,7 @@
     <CasingHeadPressure>0</CasingHeadPressure>
     <CBalOption>0</CBalOption>
     <Comments />
-    <Company>Veren</Company>
+    <Company>Majic</Company>
     <CounterWeight>0</CounterWeight>
     <CounterWeightInertia>0</CounterWeightInertia>
     <CrankHole>1 - 367.3 (cm)</CrankHole>
@@ -118,7 +118,7 @@
     <RotationKey>-1</RotationKey>
     <Runtime>24</Runtime>
     <SelectHydralicUnit>0</SelectHydralicUnit>
-    <SeparatorPressure>275.79</SeparatorPressure>
+    <SeparatorPressure>276</SeparatorPressure>
     <ServiceFactor>0.8</ServiceFactor>
     <ShallowWell>0</ShallowWell>
     <SheaveOption>0</SheaveOption>
@@ -140,8 +140,8 @@
     <TaperWeightArray>2.224:1.634:6:1.634:1.634:0:0:0:0:0:0:0:0:0:0:0</TaperWeightArray>
     <TotalDepartureOfTarget>0</TotalDepartureOfTarget>
     <TrueFluidDepth>0</TrueFluidDepth>
-    <TubingAnchorLocation>1361.3</TubingAnchorLocation>
-    <TubingGradient>9.989</TubingGradient>
+    <TubingAnchorLocation>1361</TubingAnchorLocation>
+    <TubingGradient>10</TubingGradient>
     <TubingSize>3</TubingSize>
     <TVD>0</TVD>
     <UnitsSelection>2</UnitsSelection>
@@ -152,7 +152,7 @@
     <WaterCut>73</WaterCut>
     <WaterSpecGravity>1.096</WaterSpecGravity>
     <WellDeviationType>1</WellDeviationType>
-    <WellName>191/01-27-007-09W2/00</WellName>
+    <WellName>PLACEHOLDER-WELL</WellName>
     <WheeledGuideFrictionRatio>0.1</WheeledGuideFrictionRatio>
     <DesiredMaxSPM>1</DesiredMaxSPM>
     <DesiredMinSPM>1</DesiredMinSPM>

data/golden/default.solve.sha256

@@ -1 +1 @@
-d433dd1061c9f26679507fac42299d97d6d9c0b446651eeaa6ac03529e424fa0
+5b6a699556725bee5efad5d4d32bd2b8c168a1f0104293014381c00cb2ab508d