Redesign marketing homepage (#1082)

* Redesign marketing homepage

Rework the landing page: a For humans / For agents hero toggle (Run locally
primary CTA plus a copyable agent-setup prompt), an interactive context
efficiency demo (connect services and watch the system prompt balloon into
thousands of tools versus one execute tool), a pricing section, reworked
Pick your path cards (Cloud / Desktop / CLI), a Backed by Y Combinator badge,
and copy, CTA, and layout cleanups throughout.

* Marketing: remove the trust-strip section and the founder signature

* Marketing: use svgl.app brand logos for the demo and hero icons

Replace the hand-maintained monochrome icon paths with current full-color
svgl.app logos served from public/logos and rendered as <img>. Covers the
context-efficiency demo's service icons and the hero beam (Claude, Cursor,
Codex, GitHub, Sentry, Linear). svgl has no Jira icon, so jira.svg is the Jira
mark in Jira blue.

* Marketing: enlarge the Backed by YC badge for legibility

* Marketing: mark Trace every call as coming soon

Remove the run-trace mockup, grey out the card, and add a Coming soon badge.

* Marketing: drop the eyebrow labels on the Pick your path cards

* Marketing: default the hero toggle to For agents

Author: RhysSullivan