feat(memory): add gemini embeddings + auto select providers

Co-authored-by: Gustavo Madeira Santana <gumadeiras@gmail.com>

src/config/zod-schema.agent-runtime.ts

@@ -183,24 +183,6 @@ export const AgentToolsSchema = z
         allowFrom: ElevatedAllowFromSchema,
       })
       .optional(),
-    exec: z
-      .object({
-        host: z.enum(["sandbox", "gateway", "node"]).optional(),
-        security: z.enum(["deny", "allowlist", "full"]).optional(),
-        ask: z.enum(["off", "on-miss", "always"]).optional(),
-        node: z.string().optional(),
-        backgroundMs: z.number().int().positive().optional(),
-        timeoutSec: z.number().int().positive().optional(),
-        cleanupMs: z.number().int().positive().optional(),
-        notifyOnExit: z.boolean().optional(),
-        applyPatch: z
-          .object({
-            enabled: z.boolean().optional(),
-            allowModels: z.array(z.string()).optional(),
-          })
-          .optional(),
-      })
-      .optional(),
     sandbox: z
       .object({
         tools: ToolPolicySchema,
@@ -218,7 +200,7 @@ export const MemorySearchSchema = z
         sessionMemory: z.boolean().optional(),
       })
       .optional(),
-    provider: z.union([z.literal("openai"), z.literal("gemini"), z.literal("local")]).optional(),
+    provider: z.union([z.literal("openai"), z.literal("local"), z.literal("gemini")]).optional(),
     remote: z
       .object({
         baseUrl: z.string().optional(),
@@ -235,7 +217,9 @@ export const MemorySearchSchema = z
           .optional(),
       })
       .optional(),
-    fallback: z.union([z.literal("openai"), z.literal("none")]).optional(),
+    fallback: z
+      .union([z.literal("openai"), z.literal("gemini"), z.literal("local"), z.literal("none")])
+      .optional(),
     model: z.string().optional(),
     local: z
       .object({