[anycodes]

Description

Archive the accepted unused-code cleanup decision under implemented and update its index. Add a new acceptance receipt for #147 and verified merge c7a66351127731132fb94937a1ba45aa70bf71fa; preserve the original verification checkpoint unchanged.

Type of Change

• Documentation / engineering records

Changes

• Move the canonical note and update Status together, as the ADR lifecycle requires after completion.
• Record actual implementation-head/post-merge CI and existing component evidence without rewriting history.
• No runtime, dependency, image, public contract, version or release changes.

Testing

• Scoped Markdown local links and seven-section/status consistency pass
• Git diff checks pass
• Original implementation and observed post-merge gates passed, linked in the receipt
• This documentation head's CI passed before merge

No new cloud operations are needed for this record-only change; source verification remains attributed to the implementation. All current-head gates passed before the verified merge.

[anycodes]

Verified actual merge after all current-head jobs passed. The accepted decision and index are now archived under implemented; original evidence remains unchanged. CI: https://github.com/Alibaba-Agent-Sandbox/python-sdk/actions/runs/40484163163, https://github.com/Alibaba-Agent-Sandbox/python-sdk/actions/runs/40484163014. Merge commit: 9fdeef5. No new cloud test or manual deployment/release was performed for this record-only update.