Architecture Decision Records (ADRs)

We document significant design decisions using lightweight ADRs. Each decision gets its own numbered file with context, options considered, and rationale.

Index

#	Decision	Date	Status
001	AGPL-3.0 dual licensing	2026-03-14	Accepted
002	Release branch strategy	2026-03-14	Accepted
003	DuckDB for citation graph	2026-03-14	Accepted
004	No built-in LLM calls	2026-03-14	Accepted
005	SQLite response cache	2026-03-14	Accepted
006	Multi-source federation	2026-03-14	Accepted
007	Bipartite matrix pattern for networks	2026-03-14	Accepted
008	Input validation and security	2026-03-15	Accepted
009	Spatial visualization architecture	2026-03-15	Draft

Format

Each ADR follows this structure:

# ADR-NNN: Title

**Date:** YYYY-MM-DD
**Status:** Proposed | Accepted | Superseded by ADR-NNN

## Context
What is the issue? What forces are at play?

## Options Considered
What alternatives were evaluated?

## Decision
What was chosen?

## Rationale
Why this option over the others?

## Consequences
What are the implications?