feat: add native runtime customization

OpenCode and Continue customization was previously planned but unavailable, and Runtime-native capabilities were not represented consistently across providers. GoodBuddy now provides secure Main-owned customization settings, truthful native inventories, OpenCode Agents and Commands, Continue Rules and Prompts, DSH Web Search/Fetch, MCP Prompt and Resource metadata, and manual compaction where supported.

Native capabilities are presented in eleven accessible tabs with Tools separated from Commands, LSP, and Formatters. Tool source and Ask/Execute availability are explicit, external OpenCode remains connection-only, Continue reports unsupported static tool discovery instead of advertising unreachable Skills, and disposable inventory probes avoid retaining background runtimes.

Ask remains read-only at the Runtime boundary, Execute keeps the existing authorization controls, and credentials remain confined to Main.

Release note: 新增 OpenCode、Continue 与 DeepSeek Harness 的 Runtime 原生定制与真实能力清单；工具来源、Ask/Execute 可用性、上下文压缩和 MCP 元数据现在可清晰查看，同时继续保持 Main 进程凭据保护与现有权限边界。

src/main/agent/runtime.ts

@@ -3,7 +3,10 @@ import type {
   AgentEvent,
   AgentQuestionAnswer,
   AgentRequest,
-  AgentRuntimeStatus
+  AgentRuntimeStatus,
+  RuntimeConversationCompactInput,
+  RuntimeConversationCompactResult,
+  RuntimeNativeSnapshot
 } from '../../shared/contracts'
 import type { WorkMode } from '../../shared/assistant-contracts'
 
@@ -47,6 +50,11 @@ export type RuntimeEvent =
   | RuntimeGeneratedImageEvent
   | RuntimeModelUsageEvent
 
+export type RuntimeConversationCompactOutcome = {
+  result: RuntimeConversationCompactResult
+  usageEvents?: RuntimeModelUsageEvent[]
+}
+
 export interface AgentRuntime {
   readonly runtimeId?: AgentRuntimeStatus['id']
   readonly requiresToolApproval: boolean
@@ -56,6 +64,11 @@ export interface AgentRuntime {
   readonly capability?: 'chat' | 'image-generation'
   getStatus(): Promise<AgentRuntimeStatus>
   testConnection?(): Promise<AgentRuntimeStatus>
+  getNativeSnapshot?(): Promise<RuntimeNativeSnapshot>
+  compactConversation?(
+    request: RuntimeConversationCompactInput,
+    signal: AbortSignal
+  ): Promise<RuntimeConversationCompactOutcome>
   run(
     request: AgentExecutionRequest,
     signal: AbortSignal,