feat(mosaic): migrate install wizard from v0 to v1 (#103)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

packages/mosaic/src/skills/catalog.ts

@@ -0,0 +1,96 @@
+import { readdirSync, readFileSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
+import { parse as parseYaml } from 'yaml';
+import { RECOMMENDED_SKILLS } from '../constants.js';
+
+export interface SkillEntry {
+  name: string;
+  description: string;
+  version?: string;
+  recommended: boolean;
+  source: 'canonical' | 'local';
+}
+
+export function loadSkillsCatalog(mosaicHome: string): SkillEntry[] {
+  const skills: SkillEntry[] = [];
+
+  // Load canonical skills
+  const canonicalDir = join(mosaicHome, 'skills');
+  if (existsSync(canonicalDir)) {
+    skills.push(...loadSkillsFromDir(canonicalDir, 'canonical'));
+  }
+
+  // Fallback to source repo
+  const sourceDir = join(mosaicHome, 'sources', 'agent-skills', 'skills');
+  if (skills.length === 0 && existsSync(sourceDir)) {
+    skills.push(...loadSkillsFromDir(sourceDir, 'canonical'));
+  }
+
+  // Load local skills
+  const localDir = join(mosaicHome, 'skills-local');
+  if (existsSync(localDir)) {
+    skills.push(...loadSkillsFromDir(localDir, 'local'));
+  }
+
+  return skills.sort((a, b) => a.name.localeCompare(b.name));
+}
+
+function loadSkillsFromDir(dir: string, source: 'canonical' | 'local'): SkillEntry[] {
+  const entries: SkillEntry[] = [];
+
+  let dirEntries;
+  try {
+    dirEntries = readdirSync(dir, { withFileTypes: true });
+  } catch {
+    return entries;
+  }
+
+  for (const entry of dirEntries) {
+    if (!entry.isDirectory() || entry.name.startsWith('.')) continue;
+
+    const skillMdPath = join(dir, entry.name, 'SKILL.md');
+    if (!existsSync(skillMdPath)) continue;
+
+    try {
+      const content = readFileSync(skillMdPath, 'utf-8');
+      const frontmatter = parseFrontmatter(content);
+
+      entries.push({
+        name: (frontmatter['name'] as string | undefined) ?? entry.name,
+        description: (frontmatter['description'] as string | undefined) ?? '',
+        version: frontmatter['version'] as string | undefined,
+        recommended: RECOMMENDED_SKILLS.has(entry.name),
+        source,
+      });
+    } catch {
+      // Skip malformed skills
+      entries.push({
+        name: entry.name,
+        description: '',
+        recommended: RECOMMENDED_SKILLS.has(entry.name),
+        source,
+      });
+    }
+  }
+
+  return entries;
+}
+
+function parseFrontmatter(content: string): Record<string, unknown> {
+  const match = content.match(/^---\n([\s\S]*?)\n---/);
+  if (!match?.[1]) return {};
+
+  try {
+    return (parseYaml(match[1]) as Record<string, unknown>) ?? {};
+  } catch {
+    // Fallback: simple key-value parsing
+    const result: Record<string, string> = {};
+    for (const line of match[1].split('\n')) {
+      const kv = line.match(/^(\w[\w-]*)\s*:\s*(.+)/);
+      if (kv?.[1] !== undefined && kv[2] !== undefined) {
+        result[kv[1]] = kv[2].replace(/^['"]|['"]$/g, '');
+      }
+    }
+    return result;
+  }
+}