feat(skills): preview installer plan during install

src/cli/skills.test.ts

@@ -13,6 +13,8 @@ import {
   uninstallSkillByName,
   toSkillInstallerPlanView,
   renderSkillInstallerPlan,
+  toSkillInstallPreflightView,
+  renderSkillInstallPreflight,
 } from './skills.js';
 import type { Skill } from '../skills/index.js';
 
@@ -160,6 +162,45 @@ describe('skills CLI helpers', () => {
     expect(output).toContain('[brew] brew not available in PATH');
   });
 
+  it('builds install preflight view from a source skill directory', () => {
+    const root = mkdtempSync(join(tmpdir(), 'flynn-skills-cli-'));
+    const sourceDir = join(root, 'source-skill');
+    mkdirSync(sourceDir, { recursive: true });
+    writeFileSync(join(sourceDir, 'SKILL.md'), '# Preflight Skill\nInstructions');
+    writeFileSync(
+      join(sourceDir, 'manifest.json'),
+      JSON.stringify({
+        name: 'preflight-skill',
+        description: 'Preflight test',
+        version: '1.0.0',
+        installers: [{ type: 'download', url: 'https://example.com/tool.tgz' }],
+      }),
+      'utf-8',
+    );
+
+    const view = toSkillInstallPreflightView(sourceDir);
+
+    expect(view).not.toBeNull();
+    expect(view?.skill.name).toBe('preflight-skill');
+    expect(view?.steps[0]?.installerType).toBe('download');
+
+    rmSync(root, { recursive: true, force: true });
+  });
+
+  it('renders install preflight output text', () => {
+    const output = renderSkillInstallPreflight({
+      sourcePath: '/tmp/source-skill',
+      skill: { name: 'preflight-skill', tier: 'managed', version: '1.0.0' },
+      mode: 'dry-run',
+      steps: [{ installerType: 'download', command: 'download https://example.com/tool.tgz -> <default destination>' }],
+      skipped: [],
+    });
+
+    expect(output).toContain("Install preflight for 'preflight-skill' from /tmp/source-skill");
+    expect(output).toContain('Planned installer steps:');
+    expect(output).toContain('[download] download https://example.com/tool.tgz -> <default destination>');
+  });
+
   it('summarizes refresh counts across status and tiers', () => {
     const summary = summarizeSkillsRefresh([
       buildSkill({ manifest: { name: 'a', description: 'a', version: '1.0.0', tier: 'bundled' } }),