Added nono profiles & orca integration - Added some extensions to start working on

extensions/subagents/src/backend.ts

@@ -0,0 +1,73 @@
+/**
+ * The unified backend interface: one `SubagentBackend` per agent runtime
+ * (pi, Claude Code, Codex), all producing the same `SubagentSession` shape.
+ *
+ * Planned real implementations (currently stubbed in ./backends/):
+ * - pi: in-process `createAgentSession()` via the pi SDK.
+ * - claude: `@anthropic-ai/claude-agent-sdk` `query()` in streaming-input mode.
+ * - codex: `codex app-server` child process speaking JSON-RPC over stdio.
+ */
+
+import type { Effect, Scope, Stream } from "effect";
+import { Context } from "effect";
+import type {
+  BackendName,
+  SendError,
+  SpawnError,
+  SpawnTask,
+  SubagentEvent,
+  SubagentMeta,
+} from "./domain.ts";
+
+export interface BackendCapabilities {
+  /** Can send() steer a live run (vs. only starting a fresh run when idle). */
+  readonly steering: boolean;
+  readonly modelSelection: boolean;
+  readonly reasoningEffort: boolean;
+}
+
+/**
+ * A live subagent session. The manager is the single consumer of `events`;
+ * it folds them into the `SubagentSnapshot` everything else reads.
+ */
+export interface SubagentSession {
+  /** Current metadata snapshot. Updates also arrive as MetaChanged events. */
+  readonly meta: Effect.Effect<SubagentMeta>;
+  /**
+   * All activity, normalized. Ends when the session's scope closes. Every
+   * run started within the session terminates with a RunSettled event.
+   */
+  readonly events: Stream.Stream<SubagentEvent>;
+  /**
+   * Steer the active run, or start a fresh run when idle (v1 `manager.send`
+   * semantics — the "is a run active" decision is backend-native state).
+   */
+  send(text: string): Effect.Effect<void, SendError>;
+  /**
+   * Interrupt the active run. Resolves once the backend acknowledges; the
+   * corresponding RunSettled(Interrupted) arrives on `events`. Callers bound
+   * this with a timeout and fall back to closing the session scope.
+   */
+  readonly interrupt: Effect.Effect<void>;
+}
+
+export interface SubagentBackend {
+  readonly name: BackendName;
+  readonly capabilities: BackendCapabilities;
+  /** Probe availability (binary on PATH, SDK importable, credentials). */
+  readonly available: Effect.Effect<boolean>;
+  /**
+   * Spawn a session. Scoped: closing the scope interrupts/kills the
+   * underlying session or process and ends `events`. Fire-and-forget
+   * semantics (background fibers, result delivery) live in the manager.
+   */
+  spawn(
+    task: SpawnTask,
+  ): Effect.Effect<SubagentSession, SpawnError, Scope.Scope>;
+}
+
+/** Registry of all wired backends, keyed by name. */
+export class BackendRegistry extends Context.Service<
+  BackendRegistry,
+  ReadonlyMap<BackendName, SubagentBackend>
+>()("subagents/BackendRegistry") {}