fix: add docs-to-canvas attribution handoff

[malhotra5]

This PR was created by an AI agent (OpenHands) on behalf of the user.

Summary

• Loads the existing docs PostHog initialization script from docs.json.
• Adds a docs-to-Canvas oh_ph_handoff script for links to app.all-hands.dev.
• Preserves PostHog anonymous distinct_id and session ID across docs → app navigation while carrying only bounded attribution fields.
• Respects Do Not Track and PostHog opt-out, and fails open so navigation is never blocked.

Why

OSS-10250 restores consent-aware website-to-Canvas attribution. The docs site also has many entry points to app.all-hands.dev, so loading docs analytics and adding the same structured handoff improves attribution for docs-driven Canvas/Cloud traffic.

Validation

python3 -m json.tool docs.json >/tmp/docs-json-ok
node --check openhands/canvas-handoff.js
git diff --check

Related

• Linear: OSS-10250
• Companion PRs:
  • OpenHands/company-website#678
  • fix: consume consent-aware website PostHog handoff OpenHands#16976
  • fix: support website PostHog handoff in Canvas deployment enterprise#269

@malhotra5 can click here to continue refining the PR

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