restructure

test/npm/README.md

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+# test/npm
+
+Composite action: install dependencies and run an npm test script.
+
+## Inputs
+
+| Input | Description | Default |
+|---|---|---|
+| `INSTALL_CMD` | Install command | `npm ci` |
+| `TEST_SCRIPT` | npm script to run (must exist in `package.json`) | `test` |
+| `WORKING_DIRECTORY` | Directory to run commands in | `.` |
+
+## Usage
+
+```yaml
+- uses: stat-tackler/stat-tackler-infra/test/npm@main
+  with:
+    TEST_SCRIPT: test:unit
+```
+
+### Common test scripts by project
+
+| Project | Script | Runner |
+|---|---|---|
+| `stat-tackler-api` | `test` | Jest |
+| `stat-tackler-scorekeeper` | `test:unit` | Vitest |
+| `stat-tackler-scorekeeper` | `test:integration` | Vitest |
+| `stat-tackler-scorekeeper` | `test:run` | Vitest (unit + integration) |
+| `stat-tackler-scorekeeper` | `test:coverage` | Vitest |