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.serena/memories/npm_to_yarn_migration_complete.md

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+# NPM to Yarn Migration Complete
+
+All npm commands have been successfully replaced with yarn equivalents across the project.
+
+## Files Updated:
+
+### 1. package.json
+- `"validate": "npm run lint && npm run build"` → `"validate": "yarn lint && yarn build"`
+- `"pretest": "npm run validate"` → `"pretest": "yarn validate"`
+- Package manager already set to `"packageManager": "yarn@1.22.19"`
+
+### 2. Dockerfile
+- `RUN npm install && npm cache clean --force` → `RUN yarn install --frozen-lockfile && yarn cache clean`
+- `RUN npm run build` → `RUN yarn build`
+- `RUN npm prune --production` → `RUN yarn install --production --frozen-lockfile`
+
+### 3. .github/workflows/ci.yml
+- Node.js cache changed from `'npm'` to `'yarn'`
+- `npm install` → `yarn install --frozen-lockfile`
+- `npm run lint` → `yarn lint`
+- `npm run build` → `yarn build`  
+- `npm run validate` → `yarn validate`
+
+### 4. .claude/settings.local.json
+- All npm-related Bash permissions updated:
+  - `"Bash(npm run typecheck:*)"` → `"Bash(yarn typecheck:*)"`
+  - `"Bash(npm run type-check:*)"` → `"Bash(yarn type-check:*)"`
+  - `"Bash(npm run lint)"` → `"Bash(yarn lint)"`
+  - `"Bash(npm run build:*)"` → `"Bash(yarn build:*)"`
+  - `"Bash(npm run dev:*)"` → `"Bash(yarn dev:*)"`
+  - `"Bash(npm run:*)"` → `"Bash(yarn run:*)"`
+  - `"Bash(npm start)"` → `"Bash(yarn start)"`
+
+### 5. Memory Files Updated
+- `.serena/memories/docker-traefik-ssl-complete-setup.md`: Updated management commands and build process references
+- `.serena/memories/typescript_migration_complete.md`: Updated build process documentation
+
+## Benefits of Yarn Migration:
+- Deterministic dependency resolution with yarn.lock
+- Faster installs with better caching
+- More reliable CI/CD builds with --frozen-lockfile
+- Better workspace support (if needed in future)
+- Consistent package management across development and production