- **BetterHarness — slim system prompt + Core Skills**: extracted all per-tool documentation from the system prompt into 6 embedded Core Skill files (`file-access`, `memory`, `plans`, `tasks`, `rules-skills`, `harness`). System prompt shrunk from ~470 to ~240 lines; tool docs are served lazily via `skills_read`. New `SkillSourceKind::Core` variant; `list_skills` prepends always-present core skills, `read_skill` serves embedded content, `remove_skill` rejects core names. Skills tab gets Core / User sub-tabs (Install hidden in Core view).
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