fix: address review feedback on plugin command gate

- Deny unknown/unloaded providers by default (!channelPlugin → return [])
- Add Slack to test registry with capabilities.nativeCommands to validate
  the intended code path instead of null-fallback
- Consolidate duplicate getPluginCommandSpecs import in slash.ts
- Regenerate plugin-sdk API baseline

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

extensions/slack/src/monitor/slash.ts

@@ -3,13 +3,13 @@ import { createChannelReplyPipeline } from "openclaw/plugin-sdk/channel-reply-pi
 import {
   resolveCommandAuthorizedFromAuthorizers,
   resolveNativeCommandSessionTargets,
+  getPluginCommandSpecs,
 } from "openclaw/plugin-sdk/command-auth";
 import { type ChatCommandDefinition, type CommandArgs } from "openclaw/plugin-sdk/command-auth";
 import {
   resolveNativeCommandsEnabled,
   resolveNativeSkillsEnabled,
 } from "openclaw/plugin-sdk/config-runtime";
-import { getPluginCommandSpecs } from "openclaw/plugin-sdk/command-auth";
 import type { ReplyPayload } from "openclaw/plugin-sdk/reply-runtime";
 import { danger, logVerbose } from "openclaw/plugin-sdk/runtime-env";
 import { chunkItems, normalizeLowercaseStringOrEmpty } from "openclaw/plugin-sdk/text-runtime";
@@ -676,7 +676,9 @@ export async function registerSlackMonitorSlashCommands(params: {
     );
     for (const pluginCommand of getPluginCommandSpecs("slack")) {
       const normalizedName = normalizeLowercaseStringOrEmpty(pluginCommand.name);
-      if (!normalizedName || existingNativeNames.has(normalizedName)) continue;
+      if (!normalizedName || existingNativeNames.has(normalizedName)) {
+        continue;
+      }
       existingNativeNames.add(normalizedName);
       nativeCommands.push(pluginCommand);
     }

src/plugins/command-registry-state.ts

@@ -76,9 +76,9 @@ export function getPluginCommandSpecs(provider?: string): Array<{
   if (providerName) {
     const channelPlugin = getChannelPlugin(providerName);
     if (
-      channelPlugin &&
-      !channelPlugin.capabilities?.nativeCommands &&
-      !channelPlugin.commands?.nativeCommandsAutoEnabled
+      !channelPlugin ||
+      (!channelPlugin.capabilities?.nativeCommands &&
+        !channelPlugin.commands?.nativeCommandsAutoEnabled)
     ) {
       return [];
     }

src/plugins/commands.test.ts

@@ -202,6 +202,17 @@ beforeEach(() => {
           },
         },
       },
+      {
+        pluginId: "slack",
+        source: "test",
+        plugin: {
+          ...createChannelTestPluginBase({
+            id: "slack",
+            label: "Slack",
+            capabilities: { nativeCommands: true, chatTypes: ["direct", "group"] },
+          }),
+        },
+      },
     ]),
   );
 });