v0.4.0a6

Complete the remaining four public Sandbox help imports, distinguishing root standard and code_interpreter entries. Correct current bilingual API/lifecycle documentation with real owned base/command/file and typed-timeout cleanup examples; remove unimplemented global cleanup and speculative persistence/billing APIs. No runtime behavior, signature, alias, dependency feature or attribution change.

PR131 passed all 13 exact-head checks and independent review before normal SHA-bound merge as 8e610a3. The immutable tag selects that source.

The normal paired PyPI publisher completed successfully: https://github.com/Alibaba-Agent-Sandbox/python-sdk/actions/runs/40225846586 . All four preserved candidate hashes matched official metadata and actual downloaded bytes. Fresh official non-all installation verified all 28 Template/Sandbox help imports, the installed-source namespace audit, 12 Provider help signatures, three multiline error imports and real local HTTP/files with independent owned-process absence. Both complete current design programs also passed on public a6, including typed E3001 and two independent typed-not-found checks.

These checks do not certify the full template catalog, other providers or model integrations. Earlier a4/a5 receipts and initial metadata propagation observations remain unchanged. Current installation-guidance synchronization has a separate documentation PR and no additional package release.