feat(analytics): add cookieless portfolio measurement - #136
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Adds acquisition and interaction measurement for the portfolio: Work/Journey/token-log opens, project outbound clicks, article viewport depth, Markdown/Ask AI choices, and successful copy/load-more actions.
PostHog initializes only on production
f0rr0.devusing public source configuration, with always-cookieless tracking, no person profiles, DNT/GPC support, explicit events, and URL/prompt redaction. Includes a research report, event contract, dashboard definitions, and weekly measurement loop.A native Next.js proxy sends events through the opaque
/_r7k2/*namespace, reserving no meaningful page name. It strips cookie/auth/referrer headers and preserves collector slashes alongside existing canonical page redirects. The report documents current vendor guidance and public GitHub naming examples.Validation: 314 tests pass; lint, typecheck (including deployment source), and production Next build pass. Chromium checks cover SPA attribution, disclosure keyboard activation, article thresholds, Markdown/GitHub middle-clicks, portaled AI links, hash-only navigation, storage, and disabled capture for previews/DNT/GPC. Analytics requests were intercepted locally and used only the first-party path. Proxy tests cover regional routing, request header removal and path boundaries; a running-server check verified public asset forwarding and canonical redirects. Existing filesystem-tracing warnings and GitHub embed fallback behavior remain.
Release prerequisites: enable Cookieless server hash mode in the website project and publish the accurate privacy notice. The public project token, proxy path and upstream hosts are committed in source; no PostHog environment variables are required. Real ingestion/session attribution still needs verification after activation. The standard SDK adds approximately 91 KiB gzipped on sampled pages. This PR does not merge or deploy production.