v0.2.0: visualizations, interactive browser, arXiv paper, gap analysis

New features:
- 12 interactive visualizations (ietf viz): t-SNE landscape, similarity
  heatmap, score distributions, timeline, bubble explorer, radar charts,
  author network graph, category treemap, quality vs overlap, org bar chart,
  ideas chart, and interactive draft browser
- Interactive draft browser (browser.html): filterable by category, keyword,
  score sliders with sortable table and expandable detail rows
- arXiv paper (paper/main.tex): 13-page manuscript with all findings
- Gap analysis: 12 identified under-addressed areas
- Author network: collaboration graph, org contributions, cross-org analysis
- Draft generation from gaps (ietf draft-gen)
- Auto-load .env for API keys (python-dotenv)

New modules: visualize.py, authors.py, draftgen.py
New reports: timeline, overlap-matrix, authors, gaps
New deps: plotly, matplotlib, seaborn, scipy, scikit-learn, networkx, python-dotenv

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

paper/Makefile

@@ -0,0 +1,16 @@
+# Paper build targets
+
+.PHONY: all figures pdf clean
+
+all: figures pdf
+
+figures:
+	python3 export_figures.py
+
+pdf: figures
+	pdflatex -interaction=nonstopmode main.tex
+	pdflatex -interaction=nonstopmode main.tex  # second pass for references
+
+clean:
+	rm -f main.aux main.log main.out main.bbl main.blg main.pdf
+	rm -rf figures/