feat(ipuaro): add context configuration

- Add ContextConfigSchema with systemPromptTokens, maxContextUsage, autoCompressAt, compressionMethod
- Update ContextManager to read compression threshold from config
- Update HandleMessage and useSession to pass context config
- Add 40 unit tests (32 schema + 8 integration)
- Coverage: 97.63% lines, 91.34% branches

packages/ipuaro/src/shared/constants/config.ts

@@ -106,6 +106,16 @@ export const SessionConfigSchema = z.object({
     saveInputHistory: z.boolean().default(true),
 })
 
+/**
+ * Context configuration schema.
+ */
+export const ContextConfigSchema = z.object({
+    systemPromptTokens: z.number().int().positive().default(2000),
+    maxContextUsage: z.number().min(0).max(1).default(0.8),
+    autoCompressAt: z.number().min(0).max(1).default(0.8),
+    compressionMethod: z.enum(["llm-summary", "truncate"]).default("llm-summary"),
+})
+
 /**
  * Full configuration schema.
  */
@@ -119,6 +129,7 @@ export const ConfigSchema = z.object({
     input: InputConfigSchema.default({}),
     display: DisplayConfigSchema.default({}),
     session: SessionConfigSchema.default({}),
+    context: ContextConfigSchema.default({}),
 })
 
 /**
@@ -134,6 +145,7 @@ export type EditConfig = z.infer<typeof EditConfigSchema>
 export type InputConfig = z.infer<typeof InputConfigSchema>
 export type DisplayConfig = z.infer<typeof DisplayConfigSchema>
 export type SessionConfig = z.infer<typeof SessionConfigSchema>
+export type ContextConfig = z.infer<typeof ContextConfigSchema>
 
 /**
  * Default configuration.