[lzsweb]

Summary

• Detect FaaS business-level rejections even when the HTTP response is 200.
• Reject empty layer codes and distinguish rejected layer-status queries from missing build status.
• Preserve upstream request_id and response context through layer, load, and tuning failures while keeping existing numeric SDK error codes.
• Mask error-message payloads and exclude the raw response body from ResponseFC repr.
• Add regression coverage for layer creation/status queries, runtime loading, and error-context propagation.
• Fix regression-test formatting and make the legacy RL CLI help check independent of Rich's truncation of long option names.

Scope

This PR merges dev/v2.1-2 into main and contains:

• cb6e3668: SDK business-error handling and request-context preservation.
• 7e5042be: test-only CI fixes for formatting and the legacy RL CLI help assertion; no SDK behavior changes.

It improves SDK error handling and diagnostics; it does not change gateway URLs, request headers, or region parameters, and does not fix the server-side FaaS layer not found for region null issue. A fresh curl-first probe reproduced the same business error as the earlier SDK-first probe.

Local Validation

• python -m pytest -q tests/legacy_1x/unit/test_cli_main.py tests/test_agentic_rl_fc_errors.py tests/legacy_1x/unit/test_agentic_rl_layer_status.py — 78 passed.
• python -m pytest -q tests/legacy_1x — 1122 passed, 42 skipped.
• pre-commit run --all-files — all applicable hooks passed.
• CLI validation used the CI versions of Typer (0.29.0) and Click (8.5.1); the previous help-output assertion was reproduced as failing before the fix.