Create the onboarding document

create an onboarding document, modeled on a previous client's. cover:

- points of contact: ours ([your name] — day-to-day, strategy, deliverables) and theirs (day-to-day)
- what we need from them, access this week:
  - Google Search Console — add sam@synscribe.com and raymond@synscribe.com
  - Google Ads — same access
  - CMS (if they publish blogs) — same access
  - GitHub repo — to @boblynlim and @yehjxraymond
  - PostHog, or whichever product analytics they use
  - sales / demo call recordings or transcripts, if any
- how we work: monthly cycles (proposal, their sign-off, then ship), working in their codebase via PRs where possible, and a review at the end of each month
- what we'll do once we have GSC access: pull GSC and run a technical audit, locales especially
- what we'll bring to kickoff: a locale audit, initial keyword candidates, and crawl findings on canonical / hreflang / indexing