feat(registry): add SN59 Babelbit public API discovery root surface

[minion1227]

Summary

Adds one community subnet-api surface to registry/subnets/babelbit.json (SN59 Babelbit),
live-verified public + no-auth:

• subnet-api: https://api.babelbit.ai/
  The public API discovery root — returns service, version, authentication scheme, and the
  list of public vs validator-protected endpoints as JSON. 200, no credentials.

Surface

• Netuid: 59
• Kind: subnet-api
• Public URL: https://api.babelbit.ai/
• Source URL: https://babelbit.ai/ + https://github.com/babelbit/babelbit_subnet
• Provider slug: babelbit

Validation

• npm run validate:surface -- registry/subnets/babelbit.json ✓
• npm run scan:public-safety ✓

Refs #464

[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 (a32a535).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1969   +/-   ##
=======================================
  Coverage   93.11%   93.11%           
=======================================
  Files          46       46           
  Lines        7319     7319           
  Branches     2694     2694           
=======================================
  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.