refactor(ai-gateway): scope Effect routing state

[robinbraemer]

Progresses #105 and #102.

What changed

• replace the live AI Gateway routing Promise/ManagedRuntime adapter with a scoped Effect layer over codex-router SQLite
• keep routing selection, diagnostics, lease renewal/release, health recovery, and upstream classification inside Effect
• split the Effect routing service contract from the legacy account/state adapter so Bun SQLite tests do not load unrelated Promise-era code
• build the routing layer in the server scope so SQLite remains live until shutdown
• add a Bun-hosted Effect/Vitest lane with five durable routing behaviors and a host ownership regression guard

Verification

• bun run check
  • Effect migration policy: 412 assigned TypeScript paths, zero violations
  • 529 pass / 4 intentional skip / 0 fail legacy tests
  • 260 pass Node-hosted Effect tests
  • 5 pass Bun SQLite Effect tests
  • 114 pass docs tests
  • root typecheck, docs lint, and docs typecheck pass
• executable serve smoke: health 200, empty-vault readiness 503, authenticated status 200, clean SIGINT

The legacy routing-state.ts, Promise adapter in state.ts, and their legacy consumers remain tracked migration inventory; this PR removes them from the production serve path but does not claim repository-wide Effect completion.

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Status	Name	Latest Commit	Updated (UTC)
❌ Deployment failed View logs	agentos-site	a482e2d	Aug 01 2026, 09:49 PM