consolidate the tests locations

src/__Tests/plugins/README.md

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+# Plugin Determinism Harness (Stub)
+
+Tracks PL1–PL10 gaps from `31-Nov-2025 FINDINGS.md`.
+
+- TODO: Capability catalog fixture with DSSE signatures.
+- TODO: Resource limit tests (CPU/mem/time) with deterministic seeds.
+- TODO: Offline plugin index verification and revocation path.
+- TODO: Crash kill-switch simulation fixtures.

src/__Tests/plugins/plugin-index.json

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+{
+  "version": "0.1.0-stub",
+  "plugins": [
+    {
+      "id": "example-plugin",
+      "capabilities": ["scan", "report"],
+      "dsse_manifest": "manifests/example-plugin.dsse",
+      "resource_limits": {"cpu": "500m", "memory": "256Mi"},
+      "revocation": {"cve_list": ["CVE-2025-0001"], "status": "active"}
+    }
+  ]
+}