Link setup guide to DevEx validation docs

Author: billybox1926-jpg

docs/developer-setup.md

@@ -2,6 +2,8 @@
 
 This guide provides generic onboarding defaults intended for template-based repositories.
 
+For broader contributor workflow, dependency, debugging, validation, and coding standards, see `docs/DEVEX.md`.
+
 ## 1) Prerequisites
 
 - Git 2.40+
@@ -19,6 +21,8 @@ bash scripts/bootstrap.sh
 
 If your repository is not Node.js based, adapt `scripts/bootstrap.sh` to your stack and keep command names consistent with CI.
 
+If the project needs runtime configuration, copy `config/.env.example` to your local environment file and replace placeholder values locally.
+
 ## 3) Recommended task contract
 
 To keep automation portable, define task commands with predictable names:
@@ -29,7 +33,17 @@ To keep automation portable, define task commands with predictable names:
 
 This template's reusable workflow can call any shell command, but these names improve discoverability.
 
-## 4) CI customization
+## 4) Local validation
+
+Run the reusable validation helper before opening a PR:
+
+```bash
+bash scripts/validate.sh
+```
+
+Adapt this script as the project adopts a specific language stack.
+
+## 5) CI customization
 
 The repository ships with:
 
@@ -54,14 +68,14 @@ with:
   test-command: npm test
 ```
 
-## 5) Branch and PR workflow
+## 6) Branch and PR workflow
 
 1. Create a branch from `main`.
 2. Run local validation commands before opening a PR.
 3. Open a focused PR and include context for reviewers.
 4. Merge only when CI checks pass.
 
-## 6) Lightweight automation standards
+## 7) Lightweight automation standards
 
 - Keep workflows minimal and composable.
 - Prefer reusable workflows over duplicated YAML.