feat(llm): add per-provider retry policies

packages/llm/llm-pi-ai/tests/adapter.spec.ts

@@ -303,12 +303,31 @@ describe('provider profile lifecycle', () => {
     const ctx = new Context()
     await ctx.plugin(LlmService)
     const fiber = await ctx.plugin(LlmPiAi, {
-      providers: [{ provider: 'openai' }, { provider: 'anthropic' }],
+      providers: [
+        {
+          provider: 'openai',
+          retryPolicy: {
+            mode: 'always',
+            backoff: { initialDelayMs: 25, maxDelayMs: 100, jitterRatio: 0.2 },
+          },
+        },
+        { provider: 'anthropic' },
+      ],
     })
     expect(ctx.llm.listProviders()).toEqual([
       { id: 'openai', name: 'openai' },
       { id: 'anthropic', name: 'anthropic' },
     ])
+    expect(ctx.llm.providerRetryPolicy('openai')).toEqual({
+      mode: 'always',
+      initialDelayMs: 25,
+      maxDelayMs: 100,
+      jitterRatio: 0.2,
+    })
+    expect(ctx.llm.providerRetryPolicy('anthropic')).toMatchObject({
+      mode: 'normal',
+      maxRetries: 2,
+    })
     await fiber.dispose()
     expect(ctx.llm.listProviders()).toEqual([])
   })
@@ -373,6 +392,23 @@ describe('provider profile lifecycle', () => {
     }
   })
 
+  it('rejects invalid nested retryPolicy at the provider-profile boundary', async () => {
+    expect(() => resolveProfiles([{
+      provider: 'openai',
+      retryPolicy: { mode: 'always', backoff: { jitterRatio: -1 } },
+    }])).toThrow(/retryPolicy\.backoff\.jitterRatio/)
+
+    const ctx = new Context()
+    await ctx.plugin(LlmService)
+    await expect(ctx.plugin(LlmPiAi, {
+      providers: [{
+        provider: 'openai',
+        retryPolicy: { mode: 'normal', maxRetries: -1 },
+      }],
+    })).rejects.toThrow(/retryPolicy/)
+    expect(ctx.llm.listProviders()).toEqual([])
+  })
+
   it('constructs the adapter directly and rejects routes it does not own', async () => {
     const adapter = new PiAiAdapter({ profiles: [{ provider: 'openai' }] })
     await expect(adapter.listModels('anthropic')).rejects.toMatchObject({ code: 'NO_ADAPTER' })