diff --git a/.github/workflows/pr.yaml b/.github/workflows/pr.yaml
index cc2559060..f29d3cb57 100644
--- a/.github/workflows/pr.yaml
+++ b/.github/workflows/pr.yaml
@@ -35,6 +35,10 @@ jobs:
         working-directory: ./app
         run: bun run eslint
 
+      - name: Run Stylelint (app)
+        working-directory: ./app
+        run: bun run stylelint
+
       - name: Check formatting with Prettier (website)
         working-directory: ./website
         run: bun run format:check
diff --git a/.github/workflows/push.yaml b/.github/workflows/push.yaml
index 7f0efc9f7..c774f704b 100644
--- a/.github/workflows/push.yaml
+++ b/.github/workflows/push.yaml
@@ -28,6 +28,10 @@ jobs:
         working-directory: ./app
         run: bun run eslint
 
+      - name: Run Stylelint (app)
+        working-directory: ./app
+        run: bun run stylelint
+
       - name: Check formatting with Prettier (website)
         working-directory: ./website
         run: bun run format:check
diff --git a/Makefile b/Makefile
index 7cfd0a8fd..4218c0bb5 100644
--- a/Makefile
+++ b/Makefile
@@ -1,12 +1,12 @@
-.PHONY: help install dev build test lint format clean deploy
+.PHONY: help install dev build typecheck test-all test lint format clean deploy
 
 help:
 	@echo "Available commands:"
 	@echo "  make install    - Install dependencies"
 	@echo "  make dev        - Start Next.js website + calculator dev servers"
 	@echo "  make build      - Build the website and calculator"
-	@echo "  make typecheck  - Run type checks"
-	@echo "  make test       - Run tests"
+	@echo "  make typecheck  - Run type checks (app, website, calculator)"
+	@echo "  make test       - Run tests (app, website)"
 	@echo "  make lint       - Run linters"
 	@echo "  make format     - Format code"
 	@echo "  make clean      - Clean build artifacts"
@@ -23,12 +23,15 @@ build:
 
 typecheck:
 	cd app && bun run typecheck
+	cd website && bun run typecheck
+	cd calculator-app && bun run typecheck
 
 test-all:
 	cd app && bun run test-all
 
 test:
 	cd app && bun run test
+	cd website && bun run test
 
 lint:
 	cd app && bun run lint
diff --git a/docs/engineering/skills/repository-guidance.md b/docs/engineering/skills/repository-guidance.md
index 5b4077899..57a31ce4a 100644
--- a/docs/engineering/skills/repository-guidance.md
+++ b/docs/engineering/skills/repository-guidance.md
@@ -125,4 +125,5 @@ No route embeds a GitHub Pages site as a whole page any more: the 2025 year in r
 
 1. Run `make format` to format `app/`, `website/` and `calculator-app/` with Prettier. `app/` has its own Prettier config; `website/` and `calculator-app/` use Prettier's defaults.
 2. Run `make lint` to run ESLint (and Stylelint in `app/`) in all three.
-3. CI fails on ESLint warnings as well as errors (`--max-warnings 0`), and on files Prettier would reformat, so fix all of them.
+3. Run `make typecheck` to type-check all three, and `make test` to run the `app/` and `website/` tests (`calculator-app/` has none). These match CI's type checking and tests jobs.
+4. CI fails on ESLint warnings as well as errors (`--max-warnings 0`), and on files Prettier would reformat, so fix all of them.