feat: replace kolkrabbi API with api.heroku.com repositories-api

[chap]

What

Migrates all legacy kolkrabbi.heroku.com usage in the CLI onto the new repositories-api served from api.heroku.com (Accept: application/vnd.heroku+json; version=3.repositories-api). Schema: heroku/repositories-api schema/schema.json.

The new API proxies GitHub server-side, so the CLI no longer fetches or handles raw GitHub tokens (get-github-token.ts / github-api.ts are gone).

Endpoint mapping

Legacy (kolkrabbi)	New (repositories-api)
POST /pipelines/{id}/repository {repository}	POST /pipelines/{id}/repo {repo_url}
GET /pipelines/{id}/repository	GET /pipelines/{id}/repo (returns GitHub repo object)
GET /apps/{id}/github (.repo)	GET /apps/{id}/repo (.full_name)
direct api.github.com repo lookup	GET /repos/{owner}/{name}
GET /github/repos/{repo}/tarball/{ref}	GET /repos/{owner}/{name}/archives/{ref}
direct api.github.com compare	GET /pipelines/{id}/repo/compare

Notable behavior changes

• CI org derivation (ci:run, ci:rerun, ci:debug): /repo no longer returns an organization, so the test-run organization is derived from the pipeline owner via GET /pipelines/{id} (version=3.pipelines) — team owner → owner.name ?? owner.id, otherwise omitted.
• pipelines:setup: review apps are configured through the platform review-app-config endpoint. The repositories-api has no equivalent for the old staging auto-deploy or CI auto-run enablement, so those settings — and their now-dead interactive prompts in get-settings.ts — are removed.
• reviewapps:enable/disable: full cutover — the dashboard-repositories-api feature gate and kolkrabbi fallback are removed.

Removed files

kolkrabbi-api.ts, github-api.ts, setup/get-github-token.ts, setup/get-ci-settings.ts, ci/interfaces/kolkrabbi.ts.

Testing

• yarn build ✅
• eslint: 0 errors (pre-existing any warnings only) ✅
• Affected unit suites: 36 passing / 0 failing (nock mocks repointed to api.heroku.com; added a team-owned-pipeline org-derivation test for ci:run) ✅
• Zero kolkrabbi references remain in src/ or test/ ✅