Extract Collector Store seam

.github/pull_request_template.md

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+## Checklist
+
+- [ ] `just check` passes locally.
+- [ ] After the Collector checks workflow first lands, mark `collector-checks` as required in the default branch ruleset/branch protection.

.github/workflows/checks.yml

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+name: Collector checks
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+permissions:
+  contents: read
+
+jobs:
+  collector-checks:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # ref: v6
+
+      - name: Set up Python
+        uses: actions/setup-python@ece7cb06caefa5fff74198d8649806c4678c61a1 # ref: v6
+        with:
+          python-version: "3.12"
+          cache: pip
+          cache-dependency-path: |
+            backend/requirements.txt
+            backend/requirements-dev.txt
+
+      - name: Set up Just
+        uses: extractions/setup-just@53165ef7e734c5c07cb06b3c8e7b647c5aa16db3 # ref: v4
+
+      - name: Install Collector dependencies
+        run: python -m pip install -r backend/requirements.txt -r backend/requirements-dev.txt
+
+      - name: Run Collector checks
+        run: just check

Justfile

@@ -1,6 +1,10 @@
 default:
     @just --list
 
+check:
+    ruff check backend
+    python3 -m pytest -q backend/tests
+
 status:
     #!/usr/bin/env sh
     set -eu