## Purpose

Canonical specification for article-tldr-summary requirements synced from OpenSpec change deltas.

## Requirements

### Requirement: System generates structured TL;DR summary for each fetched article
The system SHALL generate a concise summary artifact for each newly fetched article using Perplexity during ingestion.

#### Scenario: Successful summary generation
- **WHEN** a new article is accepted in ingestion
- **THEN** the system generates TL;DR bullet points and a concise summary body
- **AND** output is persisted in a structured, template-compatible format

#### Scenario: Summary generation fallback
- **WHEN** summary generation fails for an article
- **THEN** ingestion continues without failing the entire cycle
- **AND** the article remains available with existing non-summary content

### Requirement: Summary storage includes citation and source context
The system SHALL persist source/citation information needed to render summary provenance.

#### Scenario: Persist source and citation metadata
- **WHEN** summary content is stored
- **THEN** associated source/citation fields are stored with the article summary artifact
- **AND** response payloads can render a "Source and Citation" section
