Headline features:
- Harness skill paths auto-seeded; skill origin chip in /skills autocomplete
- Harness agent discovery + tool-name normalization across Claude/Codex/Kiro
- Stub `skill` tool for imported skills that call Skill(name=...)
- /subagent listing styled with white name + accent harness chip
- /theme slash command: list, switch, interactive picker
- New docs: HARNESS-COMPAT.md (user matrix) + UPSTREAM-SYNC.md (fork ledger)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>