dsh 0.1.0-rc.7

Tutorial pinned to DeepSeek Harness 0.1.0-rc.7 (commit 99f6f02).

• All 14 sections written: Foundation, The Loop, Capabilities, Composition
• Every In-real-dsh pointer references this pinned commit
• READMEs in English, 繁體中文, 简体中文

Release tags track the Studied version; the next release lands with the next Re-pin.