Context (PR #33 self-review I30 / Doc#8): `SKILL_UP_BASH` is a platform-level public contract — `internal/platform/bash_other.go` reads and prefers it over PATH on Linux/macOS too — but the only documentation lives in `docs/guide/windows.md`.
Proposal:
- Add an Environment Variables section to `docs/guide/user-config.md` (and the zh variant) covering `SKILL_UP_BASH`: precedence over PATH, full-trust requirement, applies to all platforms.
- Cross-link from `docs/guide/windows.md`.
Context (PR #33 self-review I30 / Doc#8): `SKILL_UP_BASH` is a platform-level public contract — `internal/platform/bash_other.go` reads and prefers it over PATH on Linux/macOS too — but the only documentation lives in `docs/guide/windows.md`.
Proposal: