feat(scenario): step output, getStepOutput helper, export/import MCP tools, doc restructure

- add output column to ScenarioRunStepEntity; exec step return value is JSON-serialised and stored
- expose helpers.getStepOutput(order) in exec code; negative order is relative to current step
- add get_scenario_run, wait_for_scenario_run, export_scenario, import_scenario MCP tools
- move Architecture, Key descriptors, MCP tools, Scenario, Development docs to docs/
- delete CONTRIBUTING.md (replaced by docs/development.md)

test/session.controller.spec.ts

@@ -49,7 +49,9 @@ describe("SessionController", () => {
       const res = await request(app.getHttpServer())
         .get("/sessions")
         .expect(200);
-      const names = res.body.data.map((s: { sessionName: string }) => s.sessionName);
+      const names = res.body.data.map(
+        (s: { sessionName: string }) => s.sessionName,
+      );
       expect(names).toContain("visible-session");
     });
 
@@ -97,7 +99,9 @@ describe("SessionController", () => {
       const res = await request(app.getHttpServer())
         .get("/sessions?orderBy=sessionName&orderDir=ASC")
         .expect(200);
-      const names: string[] = res.body.data.map((s: { sessionName: string }) => s.sessionName);
+      const names: string[] = res.body.data.map(
+        (s: { sessionName: string }) => s.sessionName,
+      );
       expect(names).toEqual([...names].sort());
     });
 
@@ -105,7 +109,9 @@ describe("SessionController", () => {
       const res = await request(app.getHttpServer())
         .get("/sessions?orderBy=sessionName&orderDir=DESC")
         .expect(200);
-      const names: string[] = res.body.data.map((s: { sessionName: string }) => s.sessionName);
+      const names: string[] = res.body.data.map(
+        (s: { sessionName: string }) => s.sessionName,
+      );
       expect(names).toEqual([...names].sort().reverse());
     });
 
@@ -128,7 +134,9 @@ describe("SessionController", () => {
       const res = await request(app.getHttpServer())
         .get("/sessions")
         .expect(200);
-      const names = res.body.data.map((sess: { sessionName: string }) => sess.sessionName);
+      const names = res.body.data.map(
+        (sess: { sessionName: string }) => sess.sessionName,
+      );
       expect(names).not.toContain("delete-me-session");
     });