docs: Update copilot instructions and add PR title validation workflow

.github/copilot-instructions.md

@@ -88,8 +88,10 @@ const periodMultiplier = {
 - **SonarCloud**: CI/CD quality gates (see badges in README)
 
 ## Key Files Reference
-- `package.json`: Build/test scripts and dependencies
-- `nuxt.config.ts`: Tailwind, SEO meta, static generation config
+- `package.json`: Build/test/lint scripts and dependencies
+- `nuxt.config.ts`: Tailwind, SEO meta, static generation and lint config
+- `eslint.config.mjs`: ESLint flat config entry point (auto-generated)
+- `.github/workflows/pr-title.yml`: PR title conventional commit validation
 - `vitest.config.ts`: Test runner configuration
 - `tsconfig.json`: TypeScript strict mode (recommended)
 - `app/assets/indicadores.json`: Runtime market data (do not commit hardcoded values)

.github/workflows/pr-title.yml

@@ -0,0 +1,29 @@
+name: 'Conventional PR Title'
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+concurrency:
+  group: pr-title-${{ github.event.pull_request.number }}
+  cancel-in-progress: true
+jobs:
+  check-title:
+    permissions:
+      pull-requests: read
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check pull request title for Conventional Commit
+        uses: amannn/action-semantic-pull-request@v6
+        with:
+          types: |
+            feat
+            fix
+            docs
+            style
+            refactor
+            perf
+            test
+            build
+            ci
+            chore
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}