feat(developer-tools): add stoplight-api-platform connector

[andrei-hasna]

Summary

Adds @hasna/connect-stoplight-api-platform, a first-class open-connectors package for the Stoplight API design, documentation, and governance platform. Rebuilt against the public Stoplight API (https://stoplight.io/api) and existing connector patterns (mirrors the connectors/linkedin structure) — no platform-alumia code was copied.

What's included

• Real API client (src/api/client.ts): fetch wrapper with typed StoplightApiError. Stoplight tokens are sent verbatim in the Authorization header — verified against the live API that a Bearer prefix is rejected as "Missing authorization", while a raw token yields INVALID_TOKEN.
• Typed resource methods (src/api/index.ts), each grounded in live-probed routes:
  • GET /v1/workspaces/{id}/projects, /groups
  • GET /v1/projects/{id}, /branches, /members, /table-of-contents
  • GET /v1/projects/{ws}/{project}/nodes?uri=… (OpenAPI / model / markdown read + bundled export)
  • plus a generic request() escape hatch and fromEnv() reading STOPLIGHT_API_TOKEN.
• CLI (src/cli/index.ts, commander + chalk): multi-profile config, config set-token / set-base-url, and workspace / project / node subcommands with --format json/table/pretty, --profile, --token, --base-url.
• Utils/types: multi-profile config under ~/.hasna/connectors/connect-stoplight-api-platform, output formatter, and Stoplight type definitions.
• Registry: one entry added to src/lib/connectors/developer-tools.ts (category "Developer Tools", already exists — no CATEGORIES change).
• Placeholder-only .env.example, .npmrc, .gitignore, CLAUDE.md, README.md.
• Focused unit tests (src/api/client.test.ts): URL building, Bearer-less auth header, custom base URL, error mapping, 204 handling, token preview.

Validation

• bunx tsc --noEmit (connector) — pass
• bun test (connector) — 9 pass / 0 fail
• bun build src + cli — pass
• bun test src/lib/registry.test.ts (root) — 28 pass / 0 fail
• bun run typecheck (root) — pass
• Live smoke test: CLI reached the real API and returned the expected auth error
• Risk scan: no alumia/platform-alumia/internal refs, no secrets, no browser-use/scraper deps

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