feat: add scientific data and code hosting module

[grantf04]

@algora-pbc /claim #14

Closes #14

What this adds

Adds a self-contained scientific-data-code-hosting/ module for structured artifact storage, metadata-aware previews, upload versioning/diffing, JSON-LD/DataCite/schema.org metadata, FAIR compliance, tags, executable environments, sandboxed runs, compute triggers, JSON APIs, tests, and a reviewer dashboard.

Requirement mapping

• Scalable storage engine → implemented by buildStorageManifest, covering datasets, metadata, code, notebooks, figures, models, and raw output organization.
• Drag/drop/folder organization and previews → represented through folder manifests and metadata-aware previews for CSV tables, notebooks, code, figures, and binary/model artifacts.
• Upload versioning and dataset diffing → implemented by versions and diffDatasetVersions.
• Structured metadata and standards → implemented by buildMetadataBundle with JSON-LD/schema.org and DataCite DOI metadata.
• FAIR compliance → implemented with findable, accessible, interoperable, and reusable flags.
• Scientific tags → implemented across artifact tags and metadata tags.
• Executable environments → represented by Docker/Kubernetes Python, R, and Julia environment definitions.
• Sandboxed execution and compute triggers → implemented by runExecutableEnvironment and dashboard trigger metadata for manual and cron runs.
• Reviewer dashboard and API smoke tests → implemented in src/server.js plus public/ static UI.
• Tests → implemented in test/hosting-core.test.js.

How to verify in under 5 minutes

cd scientific-data-code-hosting
npm test
npm start

Open http://localhost:4133 and verify the dashboard shows artifact previews, FAIR metadata, dataset version diff, and sandbox execution.

Optional API smoke checks:

curl -s http://localhost:4133/api/dashboard
curl -s http://localhost:4133/api/storage/manifest
curl -s "http://localhost:4133/api/execute?environment=env-python"

Validation

Commands run:

• npm test - 4 tests passing
• curl -s http://localhost:4133/api/dashboard - returns 6 artifacts, FAIR findable true, and execution status passed
• curl -s "http://localhost:4133/api/execute?environment=env-python" - returns passed, network disabled, and reproducibility score 96
• curl -i -s http://localhost:4133/package.json - returns 404 without crashing the server
• Browser demo verified at http://127.0.0.1:4133/: storage engine, metadata/FAIR, versioning, and executable environment panels render with 0 console errors
• ffprobe verified the committed demo video is 1280x760 and 8 seconds long

Demo

• Short demo video: scientific-data-code-hosting-demo.mp4
• Screenshot: dashboard.png
• Demo script: scientific-data-code-hosting/docs/demo-script.md

Scope

This PR is intentionally self-contained under scientific-data-code-hosting/ and avoids unrelated root-level changes except adding the module link to the root README.

[grantf04]

@algora-pbc /claim #14

[grantf04]

/claim #14