feat(codespace): add Azure CLI devcontainer and az login guide

.devcontainer/devcontainer.json

@@ -1,13 +1,25 @@
 {
-    "name": "HYF Week 2 Assignment",
-    "image": "mcr.microsoft.com/devcontainers/python:3.11",
-    "customizations": {
-        "vscode": {
-            "extensions": [
-                "ms-python.python",
-                "ms-python.vscode-pylance"
-            ]
+  "name": "Week 2 Assignment",
+  "image": "mcr.microsoft.com/devcontainers/python:3.11",
+  "features": {
+    "ghcr.io/devcontainers/features/azure-cli:1": {}
+  },
+  "postCreateCommand": "python3 -m pip install -r task-1/requirements.txt",
+  "customizations": {
+    "vscode": {
+      "extensions": [
+        "ms-python.python",
+        "ms-python.vscode-pylance",
+        "ms-python.debugpy",
+        "charliermarsh.ruff"
+      ],
+      "settings": {
+        "python.defaultInterpreterPath": "/usr/local/bin/python",
+        "[python]": {
+          "editor.defaultFormatter": "charliermarsh.ruff",
+          "editor.formatOnSave": true
         }
-    },
-    "postCreateCommand": "python3 -m pip install -r task-1/requirements.txt && echo '✅ HYF Week 2 Assignment Codespace ready. Run the auto-grader locally with: bash .hyf/test.sh && cat .hyf/score.json'"
+      }
+    }
+  }
 }

AZURE_LOGIN.md

@@ -0,0 +1,53 @@
+# Logging in to Azure
+
+The Week 2 assignment requires access to the HackYourFuture Azure tenant to upload files to Azure Blob Storage (Task 3).
+
+## In GitHub Codespaces
+
+The Azure CLI is pre-installed in this Codespace. You only need to authenticate.
+
+Run the following command in the Codespace terminal:
+
+```bash
+az login --use-device-code
+```
+
+You will see output like:
+
+```text
+To sign in, use a web browser to open the page https://microsoft.com/devicelogin
+and enter the code XXXXXXXX to authenticate.
+```
+
+1. Open [microsoft.com/devicelogin](https://microsoft.com/devicelogin) in your browser.
+2. Enter the code shown in the terminal.
+3. Sign in with the HackYourFuture credentials your teacher provided (format: `firstname.lastname@hackyourfuture.net` or similar).
+4. Return to the Codespace terminal. You should see your account details printed.
+
+Verify the login succeeded:
+
+```bash
+az account show --query "{user:user.name, subscription:name, tenant:homeTenantId}" --output table
+```
+
+The `user` field should show your HackYourFuture account email.
+
+## On your local machine
+
+If you are working locally and the Azure CLI is already installed from Week 1, run:
+
+```bash
+az login
+```
+
+This opens a browser window for you to sign in. After signing in, return to the terminal and verify with the command above.
+
+If `az` is not installed, follow the [official installation guide](https://learn.microsoft.com/en-us/cli/azure/install-azure-cli) for your OS, then run `az login`.
+
+## Troubleshooting
+
+**"The subscription is not in the HackYourFuture tenant"**: You are logged in with a personal or work account. Run `az logout`, then `az login --use-device-code` again and use the HYF credentials.
+
+**"Authorization failed" on storage commands**: Your account may not have the `Storage Blob Data Contributor` role on `sthyfstudentsdemo`. Contact your teacher.
+
+**Code expired**: The device login code is valid for 15 minutes. If it expires, re-run `az login --use-device-code` to get a new one.

README.md

@@ -26,7 +26,7 @@ cohort copies.
 |---|---|---|---|
 | **Task 1** — Cleaner Pipeline | `task-1/` | 60 | A modular Python pipeline with `config.py` (env-var loading), `models.py` (`Transaction` dataclass with `__post_init__` validation), `transforms.py` (4+ pure composable functions, no mutation), `pipeline.py` (orchestrator), and `tests/test_transforms.py` (4+ pytest tests). Reads `data/messy_sales.csv`, writes `output/clean_sales.csv`. |
 | **Task 2** — AI Debug Report | `task-2/` | 20 | Document one debugging session where you used an LLM to fix a bug. Fill in the four sections of `AI_DEBUG.md`. |
-| **Task 3** — Azure Blob Upload | `task-3/` | 20 | Upload `task-1/output/clean_sales.csv` to a private Blob container in the HYF Azure storage account using the portal's Storage Browser. Save your screenshot as `task-3/assets/azure_blob_week2.png` (`.jpg`/`.jpeg` also accepted) and the blob URL in `task-3/assets/blob_url.txt`. |
+| **Task 3** — Azure Blob Upload | `task-3/` | 20 | Upload `task-1/output/clean_sales.csv` to a private Blob container in the HYF Azure storage account using the portal's Storage Browser. Save your screenshot as `task-3/assets/azure_blob_week2.png` (`.jpg`/`.jpeg` also accepted) and the blob URL in `task-3/assets/blob_url.txt`. Working in Codespaces? See [AZURE_LOGIN.md](AZURE_LOGIN.md) to authenticate first. |
 
 Total: 100 · Passing: 60.