docs(readme): flagship treatment with wordmark, preset gallery, orb pack

[wranngle]

Flagship README per the readme-excellence playbook.

• Centered header: light+dark wordmark picture (gradient sampled from the live topbar treatment), capability-noun eyebrow, pipe-nav, live-product CTA front and center, sponsor line, badge rows including the new v1.0.0 release pill.
• Committed brand assets under docs/brand/ (wordmark pair + preset gallery contact sheet rendered by the engine).
• Grab-an-orb table: 7 of the 12 pre-exported preset WebPs attached to release v1.0.0, sizes and frame counts from the measured export run.
• Corrects stale counts: 25/27 parameters -> 34, seven built-ins -> 12, five texture styles -> seven. Drops the [!NOTE] callout and em-dashes per the playbook.

Gates run on this branch:

• rendered HTML via gh api readme?ref=docs/flagship-readme: zero unable-to-render boxes
• committed wordmark + gallery viewed at final paths (byte-identical to sources)
• every link and image resolves (stargazers 404s only for unauthenticated curl; same link ships on pinchgrab)
• zero em/en-dashes
• e2e 28/28 locally

🤖 Generated with Claude Code