Add Cloud Agent development environment config

[wallscaler]

Summary

Adds a reproducible Cloud Agent development environment for the Cathedral SN39 repository. There was no committed .cursor/environment.json before; this makes the repo fully usable in Cloud Agents.

What's included

• .cursor/install.sh — idempotent bootstrap that:
  • installs the python3.12-venv seed package (Cursor's default image ships Python 3.12 but omits it, so python3 -m venv otherwise fails with an ensurepip error);
  • creates an isolated .venv;
  • installs -e '.[test]' (the same mechanism + reviewed ruff/pytest toolchain that .github/workflows/required-checks.yml uses) plus python-multipart and blake3, the two runtime deps the default SQLite-backed publisher server needs for multipart submit and canonical hashing. Postgres (psycopg2) and S3 (boto3) stay optional and load lazily.
• .cursor/environment.json — wires install to the script, exposes the publisher on port 8000, and runs scaffold.publisher.server:app (uvicorn) in a publisher terminal for local development.

Validation performed on the VM

Check	Result
ruff check + ruff format --check (cathedral_thin tests/thin tests/boundary)	Passed
pytest -q tests/thin tests/boundary	151 passed
cathedral-thin-e2e	ok: true, exit 0
Publisher server /health/ready	status: ok, db: ok, sr25519_backend: bittensor
Synthetic-boolean readiness-probe verify (SAT solve → submit)	Valid solution accepted; unsatisfying + malformed rejected
Install idempotence	Passed twice
Draft environment build (this branch)	SUCCEEDED — install script ran end-to-end on a fresh checkout

No application code changed; only environment configuration was added.

The draft build was created from this branch ref (testable, not promotable). After merge to main, a build from the default branch is promotable, and the committed .cursor/environment.json becomes the highest-precedence environment source for future Cloud Agents.

  

[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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[cursor]

Publisher terminal missing runtime deps

High Severity

The bootstrap installs .[test] plus python-multipart and blake3, but the publisher terminal runs uvicorn against scaffold.publisher.server:app, which hard-imports fastapi. Neither fastapi nor uvicorn comes from .[test] or the base package deps; they live in the [publisher] extra. On a fresh Cloud Agent, the publisher terminal fails at startup and the configured port never comes up.

Additional Locations (1)

• .cursor/environment.json#L6-L7

 

^{Reviewed by Cursor Bugbot for commit 7384677. Configure here.}