chore: repo scaffold, Apache-2.0, test harness, CI workflows

Local pytest execution is skipped by owner decision: no release of
pytest-homeassistant-custom-component that pins a Home Assistant
2026.9.x floor installs on Python 3.13 (0.13.317+ requires Python
3.14, which this workstation does not have). requirements_test.txt
is pinned to the correct >=0.13.317 range for CI (Python 3.14) and
files are validated with py_compile instead of a local pytest run.

CI workflows (test.yaml, validate.yaml) moved forward from a later
task since, with local testing gone, CI is the only gate and must
exist before the code it gates.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01739Seac5eMAfNwFeiwV5r4

.github/workflows/test.yaml

@@ -0,0 +1,12 @@
+name: test
+on: [push, pull_request]
+jobs:
+  pytest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: "3.14"
+      - run: pip install -r requirements_test.txt
+      - run: pytest tests/ -v

.github/workflows/validate.yaml

@@ -0,0 +1,15 @@
+name: validate
+on: [push, pull_request]
+jobs:
+  hassfest:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: home-assistant/actions/hassfest@master
+  hacs:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: hacs/action@main
+        with:
+          category: integration