fix: align SkillHub release contract

[freelw]

Summary

• publish exactly three raw platform binaries: macOS ARM64, macOS Intel x64, and Windows x64
• package the Skill with SKILL.md, references/, and scripts/ at ZIP root for direct SkillHub upload
• align wait-text with browser-cli PR #115: normalized, case-insensitive contains by default and exact matching via --exact
• update installers and docs for the revised asset names and supported platforms

Validation

• cargo test --all-targets --locked (7 passed)
• cargo clippy --all-targets --locked -- -D warnings
• cargo fmt --all
• Skill Creator quick_validate.py
• deterministic ZIP generation and archive integrity/root-layout assertions
• release matrix assertion: exactly 3 targets, no Linux release target
• CLI smoke: wait-text --help; obsolete --match contains rejected with exit 2