docs: introduce Mercury Notebook Deliverable Pattern

docs/Pattern_Outline_V1-00.md

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+# [Pattern Name] Pattern v1.0.0
+
+One-sentence description of what this pattern standardizes and which Django applications use it.
+
+## 🐾 Red Panda Approval™
+
+This pattern follows Red Panda Approval standards.
+
+---
+
+## Why a Pattern, Not a Shared [Implementation]
+
+Explain the domain variability that makes a single shared model/function/utility impractical.
+
+List concrete examples of how different domains need different behavior:
+
+- A [domain A] app needs [field/behavior X]
+- A [domain B] app needs [field/behavior Y]
+- A [domain C] app needs [field/behavior Z]
+
+Instead, this pattern defines:
+
+- **Required [fields/interface]** — every implementation must have
+- **Recommended [fields/behaviors]** — most apps should include
+- **Extension guidelines** — for domain-specific needs
+- **Standard choice values** — for interoperability
+
+---
+
+## Required [Fields / Interface]
+
+The non-negotiable minimum every implementation must provide.
+
+```python
+# Required fields or function signature
+```
+
+---
+
+## Standard Choice Values
+
+Use these exact values for interoperability between apps.
+
+### CHOICE_A
+
+```python
+CHOICE_A = [
+    ("value-a", "Label A"),
+    ("value-b", "Label B"),
+]
+```
+
+### CHOICE_B
+
+```python
+CHOICE_B = [
+    ("value-x", "Label X"),
+    ("value-y", "Label Y"),
+]
+```
+
+---
+
+## Recommended [Fields / Behaviors]
+
+Fields or behaviors that most apps should include but are not strictly required.
+
+```python
+# Recommended additions
+```
+
+---
+
+## [Pattern Variant 1]
+
+Description of the first common implementation approach.
+
+```python
+# Code example
+```
+
+---
+
+## [Pattern Variant 2]
+
+Description of the second common implementation approach.
+
+```python
+# Code example
+```
+
+---
+
+## [Pattern Variant 3]
+
+Description of a third approach (e.g., background task, management command, signal).
+
+```python
+# Code example
+```
+
+---
+
+## Domain Extension Examples
+
+### [Domain A] App
+
+```python
+# Domain-specific extension example
+```
+
+### [Domain B] App
+
+```python
+# Domain-specific extension example
+```
+
+---
+
+## Anti-Patterns
+
+- ❌ Don't [common mistake 1]
+- ❌ Don't [common mistake 2]
+- ❌ Don't [common mistake 3]
+
+---
+
+## Settings
+
+Document any Django settings this pattern recognizes:
+
+```python
+# settings.py
+SETTING_NAME = default_value   # Description of what it controls
+```
+
+---
+
+## Testing
+
+Standard test cases every implementation should cover.
+
+```python
+class My[Pattern]Test(TestCase):
+    def test_[happy_path](self):
+        """[Happy path scenario]."""
+        pass
+
+    def test_[edge_case](self):
+        """[Edge case or negative test]."""
+        pass
+```