feat: add provider-neutral LLM layer with secrets, budgets, recording and prompts

Phase 7 (ADR-0004). Cognitive code asks the router for a role; the
router maps roles to configured models with ordered fallbacks, applies
global and per-mind daily token budgets and a concurrency limit, records
every call (request, response, usage, latency, cost, seed, request hash)
and can serve recordings back for exact replay. Providers are raw HTTP
clients for OpenAI-compatible, Anthropic and Ollama endpoints, with
embedding support for the embed role wired into memory retrieval.

Secrets are references only: env:, file:, or enc: values encrypted with
AES-256-GCM under NOEMA_MASTER_KEY; keys are resolved at call time and
never rendered, logged or exported. Outbound HTTP refuses private and
loopback addresses at dial time unless a provider explicitly allows it,
bounds redirects and caps bodies. Provider errors are scrubbed.

Prompts are named, versioned rows with system and user templates and an
optional JSON schema; untrusted text enters only through delimited data
blocks. Six defaults are seeded and never overwritten. The UI adds the
LLM page (providers, models, role matrix, usage, errors, budgets), a
provider page with connectivity test, and a prompt manager with editor,
test runner, history, restore, clone and diff. CLI: provider, prompt.

internal/app/app.go

@@ -16,9 +16,12 @@ import (
 	"github.com/andydixon/noema/internal/brain"
 	"github.com/andydixon/noema/internal/config"
 	"github.com/andydixon/noema/internal/events"
+	"github.com/andydixon/noema/internal/llm/prompts"
+	"github.com/andydixon/noema/internal/llm/router"
 	"github.com/andydixon/noema/internal/memory"
 	"github.com/andydixon/noema/internal/minds"
 	"github.com/andydixon/noema/internal/observability"
+	"github.com/andydixon/noema/internal/security/secrets"
 )
 
 // Deps is everything a handler may need. Fields are added per phase.
@@ -34,6 +37,10 @@ type Deps struct {
 	Brain      *brain.Manager
 	Memory     *memory.Store
 	Beliefs    *beliefs.Store
+	LLM        *router.Router
+	LLMStore   *router.Store
+	Prompts    *prompts.Store
+	Secrets    *secrets.Resolver
 	Migrations fs.FS
 	Started    time.Time
 }