chore(go): audit providers copilot droid augment cline

Move the four providers onto managed_runtime.go and shell_command.go;
keep the Auggie wrappers, Cline metadata wrappers, and the Copilot and
Droid precondition handling provider-local.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

cmd/elydora/plugins/gemini_security_test.go

@@ -164,10 +164,10 @@ func TestGeminiValidatesManagedRuntimeInputsBeforeWrites(t *testing.T) {
 		}, "query parameters"},
 		{"guard path", func(f *geminiFixture) {
 			f.config.GuardScriptPath = filepath.Join(f.homeDir, "outside", "guard.js")
-		}, "managed Elydora agent directory"},
+		}, "managed agent directory"},
 		{"audit path", func(f *geminiFixture) {
 			f.config.HookScript = filepath.Join(f.homeDir, "outside", "hook.js")
-		}, "managed Elydora agent directory"},
+		}, "managed agent directory"},
 	} {
 		t.Run(testCase.name, func(t *testing.T) {
 			fixture := prepareGeminiFixture(t, geminiFixtureOptions{})