Initial boilerplate scaffold for continuum-schemas

Protobuf data model (Template/PrintJob/MaterialProfile/PrintParameters)
with codegen targets for TypeBox+TS types (packages/ts-types) and
prost-derived Rust structs (packages/rust-types).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

proto/continuum/v1/print_job.proto

@@ -0,0 +1,27 @@
+syntax = "proto3";
+
+package continuum.v1;
+
+import "continuum/v1/template.proto";
+
+enum PrintJobStatus {
+  PRINT_JOB_STATUS_UNSPECIFIED = 0;
+  PRINT_JOB_STATUS_QUEUED = 1;
+  PRINT_JOB_STATUS_PRINTING = 2;
+  PRINT_JOB_STATUS_PAUSED = 3;
+  PRINT_JOB_STATUS_COMPLETED = 4;
+  PRINT_JOB_STATUS_FAILED = 5;
+  PRINT_JOB_STATUS_CANCELLED = 6;
+}
+
+message PrintJob {
+  string id = 1;
+  string farm_id = 2;
+  string printer_id = 3;
+  string template_id = 4;
+  PrintJobStatus status = 5;
+  double progress_percent = 6;
+  int64 started_at_unix = 7;
+  int64 completed_at_unix = 8;
+  string gcode_file_key = 9;
+}