Feat: /capture endpoint core (Phase A) — single-post extraction

Feat: living-library merge on import (Phase 1)

Feat: client-side library persistence (localStorage restore card)

Add end-to-end pipeline test through the real routes (CI)

CI: bump actions to Node 24 versions

#15: optional GitHub→HF Space sync workflow

Demarcate the two deployment modes + add guardrails, CLAUDE.md

Feature: quality benchmark suite + CI regression test