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/linting.yml

@@ -2,7 +2,7 @@ name: 🚦 Security & Quality Gate
 
 on:
   pull_request:
-    types: [opened, edited, synchronize, reopened]
+    types: [opened, synchronize, reopened]
     branches: [develop, master]
   workflow_dispatch:
   push:
@@ -16,42 +16,8 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  validate_pr_title:
-    name: "📝 Validate PR Title"
-    if: github.event_name == 'pull_request'
-    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
-
   dependency-review:
     name: 🔍 Vulnerable Dependencies
-    # PR title/body edits can't change the dependency graph — only re-run on code events.
-    if: github.event.action != 'edited'
     runs-on: ubuntu-26.04
     permissions:
       contents: read
@@ -71,8 +37,6 @@ jobs:
 
   expo-doctor:
     name: 🚑 Expo Doctor Check
-    # PR title/body edits can't change the project — only re-run on code events.
-    if: github.event.action != 'edited'
     runs-on: ubuntu-26.04
     steps:
       - parallel:
@@ -108,8 +72,6 @@ jobs:
 
   code_quality:
     name: "🔍 Lint & Test (${{ matrix.command }})"
-    # PR title/body edits can't change the code — only re-run on code events.
-    if: github.event.action != 'edited'
     runs-on: ubuntu-26.04
     strategy:
       fail-fast: false