coder(providers): remove retired cursor and copilot providers

Drop both retired providers from BooCoder's provider layer: acp-spawn argv cases, provider-manifest mode blocks + manifest keys, provider-commands maps, the provider-snapshot cursor model-CLI branch (+ orphaned exec/promisify imports), the agent-probe copilot ACP-detect branch, and the now-dead cursor-models module + its test. The PROVIDERS registry array already lacked both. Built-ins unchanged: claude, opencode, goose, qwen, native boocode.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

apps/coder/src/services/provider-manifest.ts

@@ -24,31 +24,6 @@ const OPENCODE_MODES: ProviderMode[] = [
   { id: 'full-access', label: 'Full Access', description: 'Auto-approves all tool prompts', isUnattended: true },
 ];
 
-const COPILOT_MODES: ProviderMode[] = [
-  {
-    id: 'https://agentclientprotocol.com/protocol/session-modes#agent',
-    label: 'Agent',
-    description: 'Default agent mode',
-  },
-  {
-    id: 'https://agentclientprotocol.com/protocol/session-modes#plan',
-    label: 'Plan',
-    description: 'Plan mode for multi-step work',
-  },
-  {
-    id: 'allow-all',
-    label: 'Allow All',
-    description: 'Automatically approves all tool, path, and URL requests',
-    isUnattended: true,
-  },
-];
-
-const CURSOR_CLI_MODES: ProviderMode[] = [
-  { id: 'agent', label: 'Agent', description: 'Full agent capabilities with tool access' },
-  { id: 'plan', label: 'Plan', description: 'Read-only planning mode' },
-  { id: 'ask', label: 'Ask', description: 'Q&A read-only mode' },
-];
-
 const QWEN_PTY_MODES: ProviderMode[] = [
   { id: 'default', label: 'Default', description: 'Prompt for approval' },
   { id: 'plan', label: 'Plan', description: 'Plan only — no edits' },
@@ -75,14 +50,6 @@ export const PROVIDER_MANIFEST: Record<string, ProviderManifestEntry> = {
     defaultModeId: 'build',
     modes: OPENCODE_MODES,
   },
-  copilot: {
-    defaultModeId: 'https://agentclientprotocol.com/protocol/session-modes#agent',
-    modes: COPILOT_MODES,
-  },
-  cursor: {
-    defaultModeId: 'agent',
-    modes: CURSOR_CLI_MODES,
-  },
   goose: {
     defaultModeId: null,
     modes: [],