JevGraph v0.1.1 — Validated live batch default

v0.1.1 is the recommended hackathon release.

This patch changes the default Jev and benchmark batch size from 32 to 8 and updates the examples and architecture notes. The v0.1 live evidence observed an HTTP 503 for one 32-question Gateway request, while eight-question batches supported the published pilot. This is a conservative operational default, not a provider throughput guarantee.

Everything from v0.1.0 remains included: bounded candidate generation, evidence spans, typed Jev decisions through Vercel AI Gateway, budget and no-retry gates, FewRel tooling, sharded benchmark merging, aggregate evidence, and CSV/Neo4j exports.

Validation: Python 3.11 and 3.13 CI passed; 12 tests, Ruff, wheel/sdist build, and clean-wheel install smoke passed.