feat(skills): add dry-run installer planning surface

src/cli/skills.ts

@@ -2,7 +2,7 @@ import type { Command } from 'commander';
 import { resolve } from 'path';
 import { homedir } from 'os';
 import type { Skill } from '../skills/index.js';
-import { loadAllSkills, SkillInstaller } from '../skills/index.js';
+import { loadAllSkills, SkillInstaller, buildInstallerPlan } from '../skills/index.js';
 import { loadConfigSafe } from './shared.js';
 
 export interface SkillListRow {
@@ -75,6 +75,23 @@ export function renderSkillInfo(skill: Skill): string {
     lines.push(`Unavailable reasons: ${skill.unavailableReasons.join('; ')}`);
   }
 
+  if (skill.manifest.installers && skill.manifest.installers.length > 0) {
+    const plan = buildInstallerPlan(skill.manifest.installers);
+    lines.push(`Installer plan mode: ${plan.mode}`);
+    if (plan.steps.length > 0) {
+      lines.push('Installer planned steps:');
+      for (const step of plan.steps) {
+        lines.push(`- [${step.installerType}] ${step.command}`);
+      }
+    }
+    if (plan.skipped.length > 0) {
+      lines.push('Installer skipped steps:');
+      for (const skip of plan.skipped) {
+        lines.push(`- [${skip.installerType}] ${skip.reason}`);
+      }
+    }
+  }
+
   return lines.join('\n');
 }