semi implemented and features implemented save checkpoint

docs/features/unchecked/sdk/sdk-generator-toolchain.md

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+# SDK Generator Toolchain (Multi-Language)
+
+## Module
+Sdk
+
+## Status
+IMPLEMENTED
+
+## Description
+Multi-language SDK generator toolchain producing typed API clients in TypeScript, Python, Go, and Java from OpenAPI specifications, with postprocessing, release pipelines, and offline bundle support.
+
+## Implementation Details
+- **Go Generator**: `src/Sdk/StellaOps.Sdk.Generator/go/` -- Go SDK generation configuration and scripts. Key files: `config.yaml` (OpenAPI Generator config for Go), `generate-go.sh` (generation script), `test_generate_go.sh` (test script).
+- **Java Generator**: `src/Sdk/StellaOps.Sdk.Generator/java/` -- Java SDK generation. Key files: `config.yaml`, `generate-java.sh`, `test_generate_java.sh`.
+- **Python Generator**: `src/Sdk/StellaOps.Sdk.Generator/python/` -- Python SDK generation. Key files: `config.yaml`, `generate-python.sh`, `test_generate_python.sh`.
+- **Postprocessing Pipeline**: `src/Sdk/StellaOps.Sdk.Generator/postprocess/` -- post-generation processing adding hooks, error handling, and SDK-specific customizations. Key files: `postprocess.sh` (orchestrator), `README.md` (documentation).
+- **Postprocessing Templates**: `src/Sdk/StellaOps.Sdk.Generator/postprocess/templates/` -- language-specific hook templates: `go/hooks.go`, `java/src/main/java/org/stellaops/sdk/Hooks.java`, `python/sdk_hooks.py`, `typescript/sdk-hooks.ts`, `typescript/sdk-error.ts`, `typescript/package.json`, `typescript/tsconfig.*.json`.
+- **Toolchain Lock**: `src/Sdk/StellaOps.Sdk.Generator/toolchain.lock.yaml` -- pinned versions of generator tools for reproducible builds.
+- **Toolchain Documentation**: `src/Sdk/StellaOps.Sdk.Generator/TOOLCHAIN.md` -- documentation of the toolchain, versions, and upgrade process.
+- **Vendored Tools**: `src/Sdk/StellaOps.Sdk.Generator/tools/openapi-generator-cli-7.4.0.jar` (OpenAPI Generator), `tools/jdk-21.0.1.tar.gz` (JDK for Java generation).
+- **Postprocessing Tests**: `src/Sdk/StellaOps.Sdk.Generator/postprocess/tests/test_postprocess.sh` -- tests for postprocessing pipeline.
+
+## E2E Test Plan
+- [ ] Run the Go SDK generation script (`generate-go.sh`) against the OpenAPI spec and verify it produces a compilable Go client package
+- [ ] Run the Java SDK generation script and verify the output compiles with the vendored JDK
+- [ ] Run the Python SDK generation script and verify the output is a valid Python package with correct module structure
+- [ ] Run the postprocessing pipeline on a generated TypeScript SDK and verify hooks, error handling, and package.json are correctly injected
+- [ ] Verify the toolchain lock: modify `toolchain.lock.yaml` to reference a different generator version and confirm the generation script uses the locked version
+- [ ] Run all test scripts (`test_generate_go.sh`, `test_generate_java.sh`, `test_generate_python.sh`, `test_postprocess.sh`) and verify they pass
+- [ ] Verify offline operation: run generation without network access using the vendored tools and confirm successful output