fix(tool-registry): use interactive bash availability for tool registration

🤖 Generated with assistance of [OhMyOpenCode](https://github.com/code-yeongyu/oh-my-opencode)

src/plugin/tool-registry.test.ts

@@ -83,7 +83,7 @@ describe("#given task_system configuration", () => {
 })
 
 describe("#given tmux integration is disabled", () => {
-  test("#when tool registry is created #then interactive_bash is not registered", () => {
+  test("#when system tmux is available #then interactive_bash remains registered", () => {
     const result = createToolRegistry({
       ctx: { directory: "/tmp" } as Parameters<typeof createToolRegistry>[0]["ctx"],
       pluginConfig: {
@@ -108,6 +108,38 @@ describe("#given tmux integration is disabled", () => {
         disabledSkills: new Set(),
       },
       availableCategories: [],
+      interactiveBashEnabled: true,
+    })
+
+    expect(result.filteredTools).toHaveProperty("interactive_bash")
+  })
+
+  test("#when system tmux is unavailable #then interactive_bash is not registered", () => {
+    const result = createToolRegistry({
+      ctx: { directory: "/tmp" } as Parameters<typeof createToolRegistry>[0]["ctx"],
+      pluginConfig: {
+        tmux: {
+          enabled: false,
+          layout: "main-vertical",
+          main_pane_size: 60,
+          main_pane_min_width: 120,
+          agent_pane_min_width: 40,
+          isolation: "inline",
+        },
+      },
+      managers: {
+        backgroundManager: {},
+        tmuxSessionManager: {},
+        skillMcpManager: {},
+      } as Parameters<typeof createToolRegistry>[0]["managers"],
+      skillContext: {
+        mergedSkills: [],
+        availableSkills: [],
+        browserProvider: "playwright",
+        disabledSkills: new Set(),
+      },
+      availableCategories: [],
+      interactiveBashEnabled: false,
     })
 
     expect(result.filteredTools).not.toHaveProperty("interactive_bash")