Agent builder executor (#1791)

* Add executor mock & docker
* Add bulid rpcs

Author: hulto

CLAUDE.md

@@ -79,6 +79,12 @@ cargo fmt
 2. **Code Generation**: Run `go generate ./...` after modifying ent schemas, GraphQL, or frontend
 3. **Rust Formatting**: Always run `cargo fmt` - CI will fail without it
 4. **Linear History**: Use squash merge for PRs
+5. **Generated Files**: Never manually edit generated files. Key generated files include:
+   - `tavern/internal/graphql/models/gqlgen_models.go` (generated by gqlgen)
+   - `tavern/internal/graphql/generated/*.go` (generated by gqlgen)
+   - `tavern/internal/ent/*.go` (generated by ent)
+   - `tavern/internal/builder/builderpb/*.pb.go` (generated by protoc)
+   - Run `go generate ./tavern/...` to regenerate after schema changes
 
 ## Documentation Structure