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, 33 insertions, 0 deletions

diff --git a/packages/cli/src/args.test.ts b/packages/cli/src/args.test.ts
index 992d09f..3d07c96 100644
--- a/packages/cli/src/args.test.ts
+++ b/packages/cli/src/args.test.ts
@@ -52,6 +52,7 @@ describe("parseArgs", () => {
 				reasoningEffort: undefined,
 				showReasoning: false,
 				open: false,
+				workspaceId: undefined,
 			});
 		});
 
@@ -68,6 +69,7 @@ describe("parseArgs", () => {
 				reasoningEffort: undefined,
 				showReasoning: false,
 				open: false,
+				workspaceId: undefined,
 			});
 		});
 
@@ -103,6 +105,7 @@ describe("parseArgs", () => {
 				reasoningEffort: undefined,
 				showReasoning: true,
 				open: false,
+				workspaceId: undefined,
 			});
 		});
 
@@ -119,6 +122,7 @@ describe("parseArgs", () => {
 				reasoningEffort: "high",
 				showReasoning: false,
 				open: false,
+				workspaceId: undefined,
 			});
 		});
 
@@ -183,6 +187,35 @@ describe("parseArgs", () => {
 			const result = parseArgs(["m", "--text", "x", "--conversation"], { defaultServer });
 			expect(result.kind).toBe("error");
 		});
+
+		it("parses --workspace flag", () => {
+			const result = parseArgs(["m", "--text", "x", "--workspace", "my-work"], { defaultServer });
+			expect(result).toEqual({
+				kind: "chat",
+				server: "http://localhost:24203",
+				modelName: "m",
+				text: "x",
+				file: undefined,
+				cwd: undefined,
+				conversationId: undefined,
+				reasoningEffort: undefined,
+				showReasoning: false,
+				open: false,
+				workspaceId: "my-work",
+			});
+		});
+
+		it("parses -w shorthand", () => {
+			const result = parseArgs(["m", "--text", "x", "-w", "ws"], { defaultServer });
+			expect(result.kind).toBe("chat");
+			if (result.kind === "chat") expect(result.workspaceId).toBe("ws");
+		});
+
+		it("errors when --workspace has no value", () => {
+			const result = parseArgs(["m", "--text", "x", "--workspace"], { defaultServer });
+			expect(result.kind).toBe("error");
+			if (result.kind === "error") expect(result.message).toContain("--workspace requires a value");
+		});
 	});
 
 	describe("list", () => {