feat(ci): replace the impact-card action with our own brand-styled renderer

[JSONbored]

Summary

• matthewevans/gittensor-impact-action's generic orange/gray card template didn't match this site's actual brand. Adds scripts/gittensor-impact-card.mjs, which fetches the same public api.gittensor.io data but renders 12-week sparklines (merged PRs, contributors, lines changed) and a meter (emission share) styled with this repo's real tokens (DM Sans / Space Grotesk, citron accent, ink surfaces from apps/gittensory-ui/src/styles.css), plus the real Gittensor mark (fetched live from gittensor.io/gt-logo.svg) and this repo's own new icon (apps/gittensory-ui/public/brand/gittensory-icon-citron.svg, from the brand refresh in feat(ui): rebrand to the new citron G mark and (icon)ittensory wordmark #4119).
• .github/workflows/gittensor-impact.yml now runs our own script instead of the third-party action, and drops the environment: gittensor-impact required-approval gate — that gate existed specifically because the action was ~1.5-day-old untrusted third-party code; running our own script removes that risk, so the job goes back to fully automatic (still contents: write scoped to just the one job).
• README swaps the light/dark <picture> for a single dark <img>, since the design is dark-only by choice.

Scope

• The PR title follows type(scope): short summary Conventional Commit format.
• This PR is focused and does not mix unrelated backend, UI, MCP, docs, dependency, and deploy changes.
• This follows CONTRIBUTING.md and does not reintroduce GitHub Pages, VitePress, site/, or CNAME.
• I linked a currently open issue this PR resolves — no linked issue; owner-initiated design iteration on the badge/CI work from docs(gittensor): add impact badge, CI card job, and contributing disclosure #4086/docs(readme): embed the live Gittensor contributor-impact card #4115, not tracked as a GitHub issue.

Validation

• npm run actionlint
• git diff --check
• Ran node scripts/gittensor-impact-card.mjs JSONbored/gittensory <file> directly — confirmed real data (893 PRs, 44 contributors, 210k lines, 10.0% emission share) renders correctly into a valid SVG.
• npm run test:coverage / ui:* — not applicable, scripts/** is excluded from Codecov and this doesn't touch apps/gittensory-ui/** behavior beyond the already-separate brand-refresh PR.

Safety

• No secrets, wallet details, hotkeys, coldkeys, user PATs, private keys, raw trust scores, private rankings, or private maintainer evidence are exposed.
• Public GitHub text/output only ever shows aggregate merged-PR/LOC/emission-share numbers, matching the existing framing.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	gittensory-ui	e76b853	Commit Preview URL Branch Preview URL	Jul 08 2026, 02:21 AM

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.65%. Comparing base (e86933f) to head (e76b853).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4121   +/-   ##
=======================================
  Coverage   93.65%   93.65%           
=======================================
  Files         384      384           
  Lines       35860    35860           
  Branches    13158    13158           
=======================================
  Hits        33583    33583           
  Misses       1618     1618           
  Partials      659      659           

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