feat: modernize PSO and add convergence research

Migrate the package and examples to the tensor-native PyTorch implementation, add benchmark evidence, and add the guarded post-training convergence protocol with TensorBoard progress monitoring and hash-verified recovery.

Constraint: Preserve one-shot official-test sealing and auditable research artifacts

Rejected: Commit local .omc runs and downloaded datasets | multi-gigabyte runtime state is machine-local

Confidence: high

Scope-risk: broad

Not-tested: Production CUDA run on pieroot-server

.gitignore

@@ -26,4 +26,12 @@ logs/
 발표 자료/
 
 .vscode/
-metacode/
+metacode/
+
+# uv / venv
+.venv/
+.uv/
+
+# Local research execution state and large downloaded datasets
+.omc/
+runs/