Alpha.4 release artifacts and path-discipline polish for HarnessKit.
Includes:
- Linux x86_64 release package
- macOS Intel and Apple Silicon release packages
- SHA256 checksums for all packages
- Installer, updater, and packaging target detection improvements
- Query candidate limit refinements
- Path-discipline wording and release workflow fixes
Known limitations:
- Fact-store-backed commands require the system sqlite3 CLI on PATH
- Install scripts and schema contract are still alpha
- No MCP server by design
- No public stability guarantee yet