feat: add MCP and LSP tooling support

Add global MCP/LSP settings, per-session Activity toggles, sidecar runtime integration, tests, and documentation updates.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

src/shared/contracts/channels.ts

@@ -8,6 +8,11 @@ export const ipcChannels = {
   savePattern: 'patterns:save',
   deletePattern: 'patterns:delete',
   setPatternFavorite: 'patterns:set-favorite',
+  saveMcpServer: 'tooling:mcp:save',
+  deleteMcpServer: 'tooling:mcp:delete',
+  saveLspProfile: 'tooling:lsp:save',
+  deleteLspProfile: 'tooling:lsp:delete',
+  updateSessionTooling: 'sessions:update-tooling',
   createSession: 'sessions:create',
   duplicateSession: 'sessions:duplicate',
   renameSession: 'sessions:rename',