Merge remote-tracking branch 'origin/codex/invariant-service-seam' into codex/invariant-package-registration-gate

# Conflicts:
#	.agents/notes/implemented/architecture/2026-07-19-package-owned-invariant-service.i18n.yaml
#	docs/core-data-structures/session.md
#	docs/module-graph.md
#	package.json
#	packages/sdk/scripts/tsconfig.json

packages/examples/stdio-demo/src/index.ts

@@ -97,7 +97,7 @@ export interface Config {
   skills?: agentCore.SkillConfig
   /** Model-facing bash tool config forwarded through agent-core. */
   toolBash?: NonNullable<agentCore.Config['toolBash']>
-  /** Generic background-task control-tool config forwarded through agent-core. */
+  /** Generic background-task controls forwarded through agent-core; set false to omit their tool surface. */
   toolTasks?: NonNullable<agentCore.Config['toolTasks']>
   /**
    * If set, the pre-created agent RESUMES this persisted session id instead of
@@ -125,7 +125,7 @@ export const Config: z<Config> = z.object({
   ui: UiConfigSchema,
   skills: agentCore.SkillConfigSchema,
   toolBash: agentCore.ToolBashConfigSchema,
-  toolTasks: agentCore.ToolTasksConfigSchema,
+  toolTasks: z.union([z.const(false), agentCore.ToolTasksConfigSchema]),
   resumeSessionId: z.string(),
   workspaceContext: z.union([z.const(false), workspaceContext.Config]).required(),
 })