[codex] Dogfood browser runtime telemetry in canonical demo

[blove]

Summary

• Adds vendor-neutral browser telemetry delivery via sink or endpoint, keeping PostHog-specific browser config as legacy compatibility.
• Adds browser runtime lifecycle helpers for runtime creation and stream start/end/error events with sampling and message-free error metadata.
• Dogfoods the browser telemetry in the canonical Angular demo through /api/ingest, with the demo proxy adding the Cacheplane ingest key server-side before forwarding to the website ingest route.
• Updates telemetry docs, taxonomy, and workspace path aliases for @ngaf/telemetry/*.

Validation

• PATH="/Users/blove/.nvm/versions/node/v22.14.0/bin:$PATH" NX_DAEMON=false npx nx test telemetry --skip-nx-cache --runInBand
• PATH="/Users/blove/.nvm/versions/node/v22.14.0/bin:$PATH" NX_DAEMON=false npx nx test examples-chat-angular --skip-nx-cache --runInBand
• PATH="/Users/blove/.nvm/versions/node/v22.14.0/bin:$PATH" npx vitest run scripts/langgraph-proxy.spec.ts
• PATH="/Users/blove/.nvm/versions/node/v22.14.0/bin:$PATH" NX_DAEMON=false npx nx build telemetry --skip-nx-cache
• PATH="/Users/blove/.nvm/versions/node/v22.14.0/bin:$PATH" NX_DAEMON=false npx nx build examples-chat-angular --configuration=production --skip-nx-cache
• PATH="/Users/blove/.nvm/versions/node/v22.14.0/bin:$PATH" NX_DAEMON=false npx nx lint telemetry --skip-nx-cache (passes with existing warnings in libs/telemetry/src/node/postinstall.spec.ts)
• PATH="/Users/blove/.nvm/versions/node/v22.14.0/bin:$PATH" NX_DAEMON=false npx nx lint examples-chat-angular --skip-nx-cache
• git diff --check

[vercel]

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Project	Deployment	Actions	Updated (UTC)
cacheplane	Ready	Preview, Comment	May 16, 2026 1:36am