[Core] Initial cookiecutter project

See https://github.com/Comfy-Org/cookiecutter-comfy-extension

Signed-off-by: David Feltell <david.feltell@foundry.com>

.github/ISSUE_TEMPLATE.md

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+* openassetio-comfyui version:
+* Python version:
+* Operating System:
+
+### Description
+
+Describe what you were trying to get done.
+Tell us what happened, what went wrong, and what you expected to happen.
+
+### What I Did
+
+```
+Paste the command(s) you ran and the output.
+If there was a crash, please include the traceback here.
+```

.github/workflows/build-pipeline.yml

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+name: CI build
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    env:
+      PYTHONIOENCODING: "utf8"
+    strategy:
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ["3.12"]
+
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install .[dev]
+      - name: Run Linting
+        run: |
+          ruff check .
+      - name: Run Tests
+        run: |
+          pytest tests/

.github/workflows/publish_node.yml

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+name: 📦 Publish to Comfy registry
+on:
+  workflow_dispatch:
+  push:
+    tags:
+      - '*'
+
+permissions:
+  issues: write
+
+jobs:
+  publish-node:
+    name: Publish Custom Node to registry
+    runs-on: ubuntu-latest
+    steps:
+      - name: ♻️ Check out code
+        uses: actions/checkout@v4
+      - name: 📦 Publish Custom Node
+        uses: Comfy-Org/publish-node-action@main
+        with:
+          personal_access_token: ${{ secrets.REGISTRY_ACCESS_TOKEN }}

.github/workflows/validate.yml

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+name: Validate backwards compatibility
+
+on:
+  pull_request:
+    branches:
+      - master
+      - main
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: comfy-org/node-diff@main