Fix vis-network loading and add structured slog logging throughout#5
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vis-network fix: - Switch from placeholder vendor stub to CDN (unpkg.com) in index.html - Remove vendor/vis-network.min.js from embed.go (no longer embedded) - Add graceful 'vis not loaded' error message in graph.js Structured logging (log/slog): - cmd/root.go: initialise global slog text handler; add --log-level flag (debug/info/warn/error) to control verbosity - cmd/serve.go: replace fmt.Fprintf with slog.Info/Error; log store open, LLM provider init, server start, shutdown lifecycle - cmd/index.go: slog for crawl start/complete, index start/complete, finalization phases - internal/pipeline/pipeline.go: slog throughout all phases — file count, skip/supersede decisions, chunk+embed counts, entity/relationship extraction counts, community detection progress, Finalize phase markers - internal/crawler/crawler.go: slog for sitemap discovery, BFS progress, page fetch errors, crawl summary stats - internal/api/router.go: HTTP logging middleware capturing method, path, status code, duration; 5xx logged at Error, 4xx at Warn, 2xx at Info - internal/api/handlers.go: slog.Error on all 500 responses; Info on search requests and upload jobs https://claude.ai/code/session_012X8wf4jwQFRYfMnbbWCEs5
Remove the unpkg.com CDN dependency entirely. Implement force-directed graph rendering in ~220 lines of vanilla JS using HTML5 Canvas: - Force-directed layout: repulsion (Coulomb), spring attraction along edges, gravity toward canvas centre, velocity damping - Deterministic initial positions (nodes placed on a circle) - Directional edges with arrowheads, width proportional to weight - Node size proportional to entity rank, coloured by type - Edge labels rendered at midpoint - Interactive: drag nodes, pan (background drag), scroll-to-zoom - Hover tooltips showing entity name, type and description - Cleans up ResizeObserver and cancelAnimationFrame on re-render - Zero external dependencies — works behind corporate firewalls https://claude.ai/code/session_012X8wf4jwQFRYfMnbbWCEs5
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