feat(reproduce): legacy-test framework + fixed-inlet reproduce pipeline

- Track A (legacy_test): systematic validation scripts for all trained PPO
  models using LegacyCelerisLab. Each test script rebuilds the exact legacy
  CFD environment, runs deterministic inference, and compares against
  SR_analysis reference data using DTW-based comparison. Verified: Karman
  re100/re50/re200, Vortex lamb/taylor all pass (DTW > 0.95).

- Track B (reproduce): Phase 2 open-loop CFD validation + Phase 3 DRL
  inference using the legacy-compatible config (regularized inlet with
  neq_damp=1.0, matching the legacy NBB formula). The inlet scheme fix
  improves new-CFD Karman DTW from 0.916 to 0.943.

- Fixes: action_wrapper sign convention docstring, model inventory
  duplicate entries and missing models, stale config paths in legacy
  run_all_cases.py/run_illusion_vortex.py, illusion label formatting

- Add READMEs and run-all shell scripts for both tracks
- Add .gitignore entries for runtime output directories

Co-authored-by: Cursor <cursoragent@cursor.com>

configs/config_lbm_pinball_legacy_compat.json

@@ -0,0 +1,49 @@
+{
+    "_doc": "Pinball config for legacy-compatible reproduction. Same as config_lbm_pinball.json but uses regularized inlet with NEQ damp=1.0 to match legacy NBB (f = feq_target + (f_neb - feq_neb)).",
+    "grid": {
+        "lattice_model": "D2Q9",
+        "nx": 1280,
+        "ny": 512,
+        "nz": 1
+    },
+    "physics": {
+        "data_type": "FP32",
+        "viscosity": 0.004,
+        "velocity": 0.01,
+        "rho": 1.0
+    },
+    "method": {
+        "collision": "MRT",
+        "streaming": "double_buffer",
+        "store_precision": "FP32",
+        "ddf_shifting": false,
+        "les": {
+            "enabled": false,
+            "cs": 0.16,
+            "closed_form": true
+        },
+        "trt": {
+            "magic_param": 0.1875
+        },
+        "inlet": {
+            "profile": "parabolic",
+            "scheme": "regularized",
+            "regularized_neq_damp": 1.0
+        },
+        "outlet": {
+            "mode": "neq_extrap",
+            "backflow_clamp": true,
+            "blend_alpha": 0.7,
+            "srt_neq_damp": 0.5
+        },
+        "y_wall_bc": "bounce_back",
+        "omega_guard": {
+            "min": 0.01,
+            "max": 1.99
+        }
+    },
+    "cuda": {
+        "threads_per_block": 256,
+        "compute_capability": "auto"
+    }
+}