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/shared/ipc-channels.ts

@@ -18,6 +18,7 @@ export const ipcChannels = {
   agentCancel: 'agent:cancel',
   agentApprovalRespond: 'agent:approval:respond',
   agentQuestionRespond: 'agent:question:respond',
+  agentCompactConversation: 'agent:context:compact',
   agentEvent: 'agent:event',
   browserInteract: 'browser:interact',
   browserStop: 'browser:stop',
@@ -30,6 +31,9 @@ export const ipcChannels = {
   runtimeSettingsOpenConfig: 'settings:runtime:open-config',
   runtimeSettingsTestModel: 'settings:runtime:test-model',
   runtimeSettingsTest: 'settings:runtime:test',
+  runtimeCustomizationGet: 'settings:runtime-customization:get',
+  runtimeCustomizationUpdate: 'settings:runtime-customization:update',
+  runtimeNativeSnapshot: 'settings:runtime-native:snapshot',
   channelSettingsGet: 'settings:channels:get',
   channelSettingsApply: 'settings:channels:apply',
   channelSettingsTest: 'settings:channels:test',