v0.2.0 — multi-agent skills, PaperBanana & new search backends

What's new

Added

• agent-research-aggregator skill — orchestrates parallel sub-agents to aggregate and synthesise research findings across multiple papers. Auto-detected: activates only when the host environment supports multi-agent spawning.
• setup.sh — one-shot setup script that wires the multi-agent skills integration into the host environment.
• build_pdf.py — ReportLab-based fallback PDF builder for environments without LaTeX. Produces two-column IEEE-style PDFs with clickable in-text citations and an auto-injected architecture diagram.
• PaperBanana backbone for plotting-agent — optional integration for hosted figure rendering; now accepts an OpenRouter key or a Google (Gemini) key.
• Semantic Scholar API key integration — set SEMANTIC_SCHOLAR_API_KEY to raise the literature-review-agent's rate limit beyond the anonymous tier.
• Exa search backend for literature-review-agent — semantic search via Exa; activate by setting EXA_API_KEY.

Fixed

• Pipeline bottlenecks in an end-to-end CitationRL run: redundant re-fetch loops, blocking I/O in the citation-gate helper, and a slow path in the refinement halt logic.

Changed

• Simplified PaperBanana integration surface; added upstream citation in CITATION.cff.
• Project renamed to PaperOrchestra in all README headings.
• README updated with paper preview thumbnail, performance metrics table, skills explanation, and OOS-metrics achievement badge.

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Full changelog: v0.1.0...v0.2.0