ci(lint): move PR title validation to its own workflow

Job-level 'edited' skips left matrix checks with an unexpanded
${{ matrix.command }} name and required checks stuck in Expected.
Filtering at the trigger level removes the phantom run entirely:
title edits now only run the PR title check.

.github/workflows/pr-title.yml

@@ -0,0 +1,45 @@
+name: 📝 PR Title
+
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+    branches: [develop, master]
+
+permissions:
+  contents: read
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  validate_pr_title:
+    name: "📝 Validate PR Title"
+    runs-on: ubuntu-26.04
+    permissions:
+      pull-requests: write
+      contents: read
+    steps:
+      - uses: amannn/action-semantic-pull-request@48f256284bd46cdaab1048c3721360e808335d50 # v6.1.1
+        id: lint_pr_title
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+      - uses: marocchino/sticky-pull-request-comment@0ea0beb66eb9baf113663a64ec522f60e49231c0 # v3.0.4
+        if: always() && (steps.lint_pr_title.outputs.error_message != null)
+        with:
+          header: pr-title-lint-error
+          message: |
+            Hey there and thank you for opening this pull request! 👋🏼
+            We require pull request titles to follow the [Conventional Commits specification](https://www.conventionalcommits.org/en/v1.0.0/).
+
+            **Error details:**
+            ```
+            ${{ steps.lint_pr_title.outputs.error_message }}
+            ```
+
+      - if: ${{ steps.lint_pr_title.outputs.error_message == null }}
+        uses: marocchino/sticky-pull-request-comment@0ea0beb66eb9baf113663a64ec522f60e49231c0 # v3.0.4
+        with:
+          header: pr-title-lint-error
+          delete: true