feat(registry): add SN120 Affine openapi, subnet-api, and data-artifact surfaces

[minion1227]

Add or update a subnet surface

This PR appends three community surfaces to exactly one subnet file —
registry/subnets/affine.json (SN120 Affine) — and nothing else. Each was
generated with npm run surface:add and is live-verified as public and
no-auth. Affine exposes a clean, well-formed JSON API at https://api.affine.io
covering its miner scoring and ranking; the surfaces below are its public,
read-only endpoints.

Summary

• openapi — https://api.affine.io/openapi.json
  Machine-readable spec ("Affine API", version 1.0.0, 10 paths). Fetched with
  200 application/json; surface:add parsed it and set
  schema_status: machine-readable + schema_url. The spec documents all the
  public GET endpoints (/api/v1/rank/current, /api/v1/scores/latest,
  /api/v1/scores/weights/latest, /api/v1/config, /api/v1/health, plus
  uid/hotkey lookups), so it independently proves the two surfaces below.

• subnet-api — https://api.affine.io/api/v1/scores/latest
  Public latest-scores endpoint. Returns the current block_number,
  calculated_at timestamp, and a scores array of evaluated miners, each with
  miner_hotkey, uid, model, model_revision, model_type, first_block,
  overall_score, average_score, and a per-environment scores_by_env
  breakdown (e.g. MEMORY with score/threshold/reason). Verified
  200 application/json (~21 KB), no credentials required.

• data-artifact — https://api.affine.io/api/v1/rank/current
  Public current-ranking snapshot. Returns window (current champion +
  past_champions with emission share), queue, scores, and meta.
  Verified 200 application/json (~230 KB), no credentials required — a
  substantial, regularly-updated public data artifact.

Surface

• Netuid: 120
• Kind: openapi, subnet-api, data-artifact
• Public URL: https://api.affine.io/openapi.json
• Source URL (proves the claim): https://www.affine.io/ + https://api.affine.io/openapi.json
  (the published OpenAPI spec documents both /api/v1/scores/latest and
  /api/v1/rank/current registered here)
• Provider slug: affine

Checklist

• Changes exactly one registry/subnets/affine.json file.
• Generated with npm run surface:add — lands authority: community and
  review.state: community-submitted.
• Every url is public and safe for read-only probes; the source_url
  (official site + the OpenAPI spec) independently proves the subnet publishes them.
• Public-safe: no auth-only flows, secrets, wallet/PAT data, private URLs,
  validator internals, or generated public/metagraph/** artifacts.
• Does not duplicate an existing Metagraphed surface — SN120 had no callable
  surface and is not adapter-backed. (Note: a prior unrelated PR proposing
  website/source-repo for SN120 was closed because those kinds are
  auto-promoted from on-chain identity; this PR registers only callable
  API/spec surfaces, which are net-new.)

Validation

• npm run validate:surface -- registry/subnets/affine.json → passed (3 surfaces, 1 file)
• npm run scan:public-safety → passed

Closes #676

[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 93.11%. Comparing base (7a7b0c3) to head (72a9c33).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

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  Coverage   93.11%   93.11%           
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  Files          46       46           
  Lines        7319     7319           
  Branches     2694     2694           
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  Hits         6815     6815           
  Misses         90       90           
  Partials      414      414           

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[JSONbored]

Closing this, and I want to be transparent about why.

This account is permanently blocked from contributing to our repositories — for plagiarism. In JSONbored/gittensory you filed two PRs that were copies of another contributor's open work, submitted as your own to claim the credit:

• JSONbored/gittensory#1377 was an identical copy of kiannidev's JSONbored/gittensory#1376 (same source change; tests only reworded to disguise the lift), filed ~90 minutes later against the same issue.
• JSONbored/gittensory#1378 was a byte-identical copy of kiannidev's JSONbored/gittensory#1373, filed ~2 hours later against the same issue.

Lifting another contributor's diff to claim the credit is a hard line for us — two strikes, you're out. Our Code of Conduct states it plainly: plagiarism and reward-farming result in a permanent block from contributing, enforced across JSONbored/gittensory, JSONbored/metagraphed, and JSONbored/awesome-claude.

The block is on the account, not any individual PR, so this isn't a review of the change — it's enforcement of the ban. Closed and labeled slop. This decision is final.