fix: suppress runtime context in minimal profiles

packages/core/system-prompt/tests/scoped.spec.ts

@@ -142,6 +142,23 @@ describe('scoped cache-safe context', () => {
     expect(renderContextSnapshot(await ctx.systemPrompt.assemble({ scope: scopeKeyOf(scope) })))
       .toContain('global policy')
   })
+
+  it('suppresses all context for one scope and restores it when disposed', async () => {
+    const ctx = await mount()
+    const scope = await mintScope(ctx, 'suppressed-context')
+    const key = scopeKeyOf(scope)
+    ctx.systemPrompt.context({ name: 'policy', order: 1, text: 'global policy' })
+    const dispose = scope.ctx.systemPrompt.suppressRuntimeContext()
+
+    const suppressed = await ctx.systemPrompt.assemble({ scope: key })
+    expect(suppressed.contexts).toEqual([])
+    const global = await ctx.systemPrompt.assemble()
+    expect(renderContextSnapshot(global)).toContain('global policy')
+
+    dispose()
+    expect(renderContextSnapshot(await ctx.systemPrompt.assemble({ scope: key })))
+      .toContain('global policy')
+  })
 })
 
 describe('scoped tool providers and toolOrder × restriction', () => {

packages/core/system-prompt/tests/system-prompt.spec.ts

@@ -49,6 +49,25 @@ describe('SystemPrompt', () => {
       expect(renderPrompt(assembly)).toBe('You are a helpful software engineer assistant.')
     })
 
+    it('can suppress runtime context without evaluating providers or accepting waterfall additions', async () => {
+      const ctx = new Context()
+      await ctx.plugin(SystemPrompt, { includeRuntimeContext: false })
+      let providerCalls = 0
+      ctx.systemPrompt.context({
+        name: 'policy',
+        order: 0,
+        text: () => `policy ${++providerCalls}`,
+      })
+      ctx.on('system-prompt/assemble', async (assembly, _context, next) => {
+        assembly.contexts.push({ name: 'late', text: 'late context' })
+        return next()
+      })
+
+      const assembly = await ctx.systemPrompt.assemble()
+      expect(assembly.contexts).toEqual([])
+      expect(providerCalls).toBe(0)
+    })
+
     it('tolerates a schema-bypassing direct construction (persona omitted)', async () => {
       // ctx.plugin validates + defaults the config first; a direct construction
       // skips the schema, so the ctor's `?? ''` narrowing is what fires.