feat(ci): add semantic PR title check workflow (#136)

Calls the reusable semantic PR check workflow from the org `.github`
repo.

Validates PR titles against the conventional commits spec with types and
scopes
defined centrally in `reqstool/.github`.

Depends on: reqstool/.github#2 being merged first.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Author: jimisola

.github/workflows/check-semantic-pr.yml

@@ -0,0 +1,10 @@
+name: Check Semantic PR
+on:
+  pull_request:
+    types: [opened, edited, synchronize, reopened]
+  pull_request_target:
+    types: [opened, edited, synchronize, reopened]
+
+jobs:
+  check:
+    uses: reqstool/.github/.github/workflows/check-semantic-pr.yml@main