menghuanshiguang/dsh-sunder

Replaces the harness identity block with its own prompt pack: three system-prompt sections (identity, rules, footer) in full, concise and dev presets, a per-turn rule card appended as a real user message, a remote announcement feed that falls back to a bundled copy offline, a GitHub Releases update check with an apply command, five `sunder_*` tools, and a read-only status section in Settings.