feat: workspaces — session-orchestrator + transport-http + transport-ws + cli (Wave 2+3)

session-orchestrator: workspaceId on StartTurnInput/EnqueueInput; effective cwd
  resolution (getCwd → getEffectiveCwd); auto-create workspace on turn start;
  warm parity (same effective cwd). 93 tests (+8).
transport-http: workspace routes (GET/PUT/DELETE /workspaces, title, default-cwd);
  workspaceId threading on POST /chat + queue; ?workspaceId= filter on
  GET /conversations; DELETE /conversations/:id/cwd (clears explicit cwd);
  GET /conversations/:id/lsp uses effective cwd; slug validation. 166 tests.
transport-ws: workspaceId threading on chat.send + chat.queue. 32 tests.
cli: --workspace/-w flag; ConversationMeta test fakes fixed. 123 tests.

Full typecheck EXIT 0, biome clean. 1283 vitest + 199 transport bun pass
(1 pre-existing tool-shell failure unrelated to workspaces).

1 files changed, 2 insertions, 0 deletions

diff --git a/packages/cli/src/message.ts b/packages/cli/src/message.ts
index 80befec..ec4d6d1 100644
--- a/packages/cli/src/message.ts
+++ b/packages/cli/src/message.ts
@@ -38,6 +38,7 @@ interface ChatCmd {
 	readonly cwd?: string | undefined;
 	readonly conversationId?: string | undefined;
 	readonly reasoningEffort?: ReasoningEffort | undefined;
+	readonly workspaceId?: string | undefined;
 	readonly showReasoning: boolean;
 }
 
@@ -53,5 +54,6 @@ export function buildChatRequest(cmd: ChatCmd, ctx: BuildCtx): ChatRequest {
 		...(cmd.conversationId !== undefined && { conversationId: cmd.conversationId }),
 		...(cmd.cwd !== undefined ? { cwd: cmd.cwd } : { cwd: ctx.cwd }),
 		...(cmd.reasoningEffort !== undefined && { reasoningEffort: cmd.reasoningEffort }),
+		...(cmd.workspaceId !== undefined && { workspaceId: cmd.workspaceId }),
 	};
 }