feat: scaffold electron orchestrator foundation

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

src/shared/contracts/sidecar.ts

@@ -0,0 +1,81 @@
+import type { PatternDefinition, PatternValidationIssue } from '@shared/domain/pattern';
+import type { ChatMessageRecord } from '@shared/domain/session';
+
+export interface SidecarModeCapability {
+  available: boolean;
+  reason?: string;
+}
+
+export interface SidecarCapabilities {
+  runtime: 'dotnet-maf';
+  modes: Record<PatternDefinition['mode'], SidecarModeCapability>;
+}
+
+export interface DescribeCapabilitiesCommand {
+  type: 'describe-capabilities';
+  requestId: string;
+}
+
+export interface ValidatePatternCommand {
+  type: 'validate-pattern';
+  requestId: string;
+  pattern: PatternDefinition;
+}
+
+export interface RunTurnCommand {
+  type: 'run-turn';
+  requestId: string;
+  sessionId: string;
+  projectPath: string;
+  pattern: PatternDefinition;
+  messages: ChatMessageRecord[];
+}
+
+export type SidecarCommand = DescribeCapabilitiesCommand | ValidatePatternCommand | RunTurnCommand;
+
+export interface CapabilitiesEvent {
+  type: 'capabilities';
+  requestId: string;
+  capabilities: SidecarCapabilities;
+}
+
+export interface PatternValidationEvent {
+  type: 'pattern-validation';
+  requestId: string;
+  issues: PatternValidationIssue[];
+}
+
+export interface TurnDeltaEvent {
+  type: 'turn-delta';
+  requestId: string;
+  sessionId: string;
+  messageId: string;
+  authorName: string;
+  contentDelta: string;
+}
+
+export interface TurnCompleteEvent {
+  type: 'turn-complete';
+  requestId: string;
+  sessionId: string;
+  messages: ChatMessageRecord[];
+}
+
+export interface CommandErrorEvent {
+  type: 'command-error';
+  requestId: string;
+  message: string;
+}
+
+export interface CommandCompleteEvent {
+  type: 'command-complete';
+  requestId: string;
+}
+
+export type SidecarEvent =
+  | CapabilitiesEvent
+  | PatternValidationEvent
+  | TurnDeltaEvent
+  | TurnCompleteEvent
+  | CommandErrorEvent
+  | CommandCompleteEvent;