feat(skills): add installer plan command output

src/cli/skills.ts

@@ -19,6 +19,17 @@ export interface SkillRefreshSummary {
   tiers: Record<Skill['manifest']['tier'], number>;
 }
 
+export interface SkillInstallerPlanView {
+  skill: {
+    name: string;
+    tier: Skill['manifest']['tier'];
+    version: string;
+  };
+  mode: 'dry-run';
+  steps: Array<{ installerType: string; command: string }>;
+  skipped: Array<{ installerType: string; reason: string }>;
+}
+
 export function toSkillListRows(skills: Skill[]): SkillListRow[] {
   return skills
     .map((skill) => ({
@@ -95,6 +106,47 @@ export function renderSkillInfo(skill: Skill): string {
   return lines.join('\n');
 }
 
+export function toSkillInstallerPlanView(skill: Skill): SkillInstallerPlanView {
+  const plan = buildInstallerPlan(skill.manifest.installers);
+  return {
+    skill: {
+      name: skill.manifest.name,
+      tier: skill.manifest.tier,
+      version: skill.manifest.version,
+    },
+    mode: plan.mode,
+    steps: plan.steps,
+    skipped: plan.skipped,
+  };
+}
+
+export function renderSkillInstallerPlan(view: SkillInstallerPlanView): string {
+  const lines: string[] = [
+    `Installer plan for '${view.skill.name}' (${view.skill.tier}, v${view.skill.version})`,
+    `Mode: ${view.mode}`,
+  ];
+
+  if (view.steps.length === 0) {
+    lines.push('Planned steps: none');
+  } else {
+    lines.push('Planned steps:');
+    for (const step of view.steps) {
+      lines.push(`- [${step.installerType}] ${step.command}`);
+    }
+  }
+
+  if (view.skipped.length === 0) {
+    lines.push('Skipped steps: none');
+  } else {
+    lines.push('Skipped steps:');
+    for (const skip of view.skipped) {
+      lines.push(`- [${skip.installerType}] ${skip.reason}`);
+    }
+  }
+
+  return lines.join('\n');
+}
+
 export function summarizeSkillsRefresh(skills: Skill[]): SkillRefreshSummary {
   const summary: SkillRefreshSummary = {
     total: skills.length,
@@ -319,4 +371,33 @@ export function registerSkillsCommand(program: Command): void {
 
       console.log(renderSkillsRefreshSummary(summary));
     });
+
+  skills
+    .command('plan <name>')
+    .description('Print dry-run installer plan for a skill')
+    .option('--json', 'Output as JSON')
+    .option('-c, --config <path>', 'Config file path')
+    .action((name: string, opts: { json?: boolean; config?: string }) => {
+      const loaded = loadSkillsFromConfig(opts.config);
+      if (loaded.error || !loaded.skills) {
+        console.error(loaded.error ?? 'Failed to load skills');
+        process.exitCode = 1;
+        return;
+      }
+
+      const skill = loaded.skills.find((item) => item.manifest.name === name);
+      if (!skill) {
+        console.error(`Skill '${name}' not found.`);
+        process.exitCode = 1;
+        return;
+      }
+
+      const view = toSkillInstallerPlanView(skill);
+      if (opts.json) {
+        console.log(JSON.stringify(view, null, 2));
+        return;
+      }
+
+      console.log(renderSkillInstallerPlan(view));
+    });
 }