Fix broken v2 bambulab schema refs, wire up v2 dispatchers, fix PrintJobStatus JSON mismatch

- v2/common/device/device.schema.json: stray backtick in bed $ref broke resolution
- v2/report/print/print.schema.json: ams $ref pointed at wrong path (missing ams/ subdir)
- v2/common/device/plate.schema.json: $id was copy-pasted from bed.schema.json
- Add v2/request.schema.json and v2/report.schema.json dispatchers - v2's leaf
  schemas were unreachable without them, same oneOf convention as v1
- Rewrite schemas/bambulab/README.md layout section, which still described
  v1's pre-rename paths and claimed v2 was removed
- PrintJob.status serialized as a raw i32 in Rust (prost stores proto3 enums
  as i32) while ts-types' TypeBox schema validates full enum name strings -
  add serde with= on the field so Rust JSON matches TS and protobuf's own
  canonical JSON enum mapping, plus a regression test

packages/rust-types/tests/print_job_status.rs

@@ -0,0 +1,32 @@
+use continuum_types::{PrintJob, PrintJobStatus};
+
+fn sample(status: PrintJobStatus) -> PrintJob {
+    PrintJob {
+        id: "job-1".into(),
+        farm_id: "farm-1".into(),
+        printer_id: "printer-1".into(),
+        template_id: "template-1".into(),
+        status: status as i32,
+        progress_percent: 50.0,
+        started_at_unix: 0,
+        completed_at_unix: 0,
+        gcode_file_key: "key".into(),
+    }
+}
+
+// Regression test: PrintJob.status must serialize as the full proto enum
+// name (matching ts-types' TypeBox schema), not the raw i32 prost stores
+// it as internally.
+#[test]
+fn status_serializes_as_full_proto_enum_name() {
+    let json = serde_json::to_value(sample(PrintJobStatus::Printing)).unwrap();
+    assert_eq!(json["status"], "PRINT_JOB_STATUS_PRINTING");
+}
+
+#[test]
+fn status_round_trips_through_json() {
+    let original = sample(PrintJobStatus::Completed);
+    let json = serde_json::to_string(&original).unwrap();
+    let restored: PrintJob = serde_json::from_str(&json).unwrap();
+    assert_eq!(restored.status, PrintJobStatus::Completed as i32);
+}