Step 2: Context Builder (User Message)

Module: junior.runbooks.code_review.render.build_user_message()

Transforms CollectedContext into a markdown-formatted user message for the harness.

Input

CollectedContext from Step 1.

Output: User Message (440 lines, 12,339 chars)

## Merge Request:
**Branches:**  -> main

### Commits (2)
- feat: add authentication and database layer
  Implement user authentication with token-based sessions
  and SQLite database for user management.
- feat: add API endpoints and integrate auth with greetings
  Add REST-like handlers for login, registration, search,
  admin actions, and webhook processing.
  Update hello.py to support authenticated greetings.

### Changed Files
- `api.py` (added)
- `auth.py` (added)
- `database.py` (added)
- `hello.py` (modified)

### Diff
\`\`\`diff
diff --git api.py api.py
new file mode 100644
...
<full unified diff — 385 added lines across 4 files>
...
\`\`\`

Structure

Section	Content
Header	MR title, description, branches, labels
Additional Context	--context and --context-file entries (empty here)
Commits	List of commit messages
Changed Files	File paths with status
Diff	Full unified diff in a code block

Data Flow

CollectedContext --> build_user_message() --> str (markdown)
                                                |
                                                v
                                    Sent as user message to the harness