Add lesson issue template

.github/ISSUE_TEMPLATE/lesson.md

@@ -0,0 +1,64 @@
+---
+name: Lesson
+about: Use this template to coordinate writing one lesson of a Core module after the
+  module's research is merged.
+title: "[LESSON] <NN>.<N> <Lesson Title>"
+labels: core, new-content
+assignees: ''
+
+---
+
+## Lesson
+
+Module: `NN Module Name`
+
+Lesson: `N. Lesson Title`
+
+Target file: `core/NN-slug/NN-lesson-slug.md`
+
+Research issue: #
+
+## Scope
+
+Copied from the module README, which is the source of truth. If the scope needs to change while writing, change the README in the same pull request and say why.
+
+### Learning Objectives
+
+- 
+
+### Key Topics
+
+- 
+
+### Out of Scope
+
+- 
+
+## Goal of This Issue
+
+Write the lesson. The lesson is complete when a pull request is merged that:
+
+- adds the target file, based on [`templates/lesson-template.md`](https://github.com/HardCounterIO/ode/blob/main/templates/lesson-template.md) and written to the [Style Guide](https://github.com/HardCounterIO/ode/blob/main/docs/STYLE-GUIDE.md)
+- meets each learning objective above and stays out of the out-of-scope topics, pointing to the lesson or module that covers them instead
+- passes the [checklist for authors](https://github.com/HardCounterIO/ode/blob/main/docs/STYLE-GUIDE.md#9-checklist-for-authors)
+- links the lesson from the module README's lesson list
+- updates the module's `ai_assistance` field and README **AI Assistance** section to cover this lesson
+
+The module's `status` stays `draft`. Technical review happens at the module level once its lessons are written ([Review Process](https://github.com/HardCounterIO/ode/blob/main/docs/REVIEW-PROCESS.md#6-process)).
+
+## How to Participate
+
+- **Claim:** comment on this issue to take it. A maintainer will assign you and add you to the Contributors section below. One writer leads each lesson; others are welcome to contribute.
+- **Collaborate:** open a draft pull request early and link this issue. To let co-contributors push to your branch, add them as collaborators on your fork (fork **Settings → Collaborators**). Every commit must be signed off ([DCO](https://github.com/HardCounterIO/ode/blob/main/CONTRIBUTING.md#developer-certificate-of-origin)).
+- **Boundaries:** if the lesson starts covering material owned by another lesson or module, raise it here or in the pull request rather than expanding the scope.
+- **Inactivity:** claims with no activity for 4 weeks may be released after a reminder.
+
+## Contributors
+
+Writer:
+
+Contributors:
+
+## Additional Context
+
+Anything else relevant to writing this lesson?