fix(ep-admin): restore runtime foundation for auth + scoped commands

[PaulJPhilp]

Summary

• add NodeContext.layer to the ep-admin production runtime so prompt/terminal services are available
• scope CLI execution at the root command runner (createAdminProgram) to provide runtime scope for scoped layers/effects

Why

• interactive auth flows (auth login, auth init without service-token) were failing with Terminal service not found
• several command families were failing with effect/Scope service errors in real CLI execution

Validation

• bunx vitest run packages/ep-admin/src/tests/cli-auth-contract.test.ts
• manual smoke checks:
  • ep-admin auth login now reaches prompt path (no Terminal service error)
  • ep-admin db show patterns --json and ep-admin config install skills --json no longer fail with effect/Scope service errors

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
effect-patterns	Ignored		Feb 15, 2026 9:56pm
effect-patterns-mcp-server	Ignored		Feb 15, 2026 9:56pm
effect-patterns-mcp-tier-v2	Ignored		Feb 15, 2026 9:56pm

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