Drop Protobuf; move continuum/v1 domain model to JSON Schema

Nothing imported the proto-generated code (zero references to
continuum-rust-types or @continuum/ts-types's proto export in any
consumer repo), and protobuf's real value - one schema compiled to a
compact binary wire format for both languages - never applied: BE<->proxy
and FE<->BE are both JSON. Also fixes 8 broken $ref paths in the bambulab
schemas and a root tsconfig.json that was sweeping the gitignored
examples/ directory into typecheck.

- proto/continuum/v1/*.proto -> schemas/continuum/v1/*.schema.json
- packages/rust-types: hand-written serde structs instead of
  prost-build codegen
- packages/ts-types: drop the generated/ proto barrel export, keep the
  hand-written TypeBox schemas as the TS source of truth
- root package.json: drop build:ts, protoc, ts-proto

packages/ts-types/package.json

@@ -9,8 +9,6 @@
     ".": "./src/index.ts"
   },
   "dependencies": {
-    "@sinclair/typebox": "^0.32.0",
-    "protobufjs": "^7.4.0",
-    "long": "^5.2.3"
+    "@sinclair/typebox": "^0.32.0"
   }
 }

packages/ts-types/src/index.d.ts

@@ -1,2 +1 @@
 export * from "./schemas";
-export * as proto from "./generated";

packages/ts-types/src/index.js

@@ -1,6 +1 @@
 export * from "./schemas";
-// `src/generated/**` is produced by `npm run build:ts` (protoc + ts-proto)
-// from the .proto sources in /proto and is not committed. Re-export it
-// here once generated so consumers get both the TypeBox runtime schemas
-// and the proto-derived TS types from a single package entry point.
-export * as proto from "./generated";

packages/ts-types/src/index.ts

@@ -1,7 +1 @@
 export * from "./schemas";
-
-// `src/generated/**` is produced by `npm run build:ts` (protoc + ts-proto)
-// from the .proto sources in /proto and is not committed. Re-export it
-// here once generated so consumers get both the TypeBox runtime schemas
-// and the proto-derived TS types from a single package entry point.
-export * as proto from "./generated";