v0.9.0

Added

• Early input validation with helpful error hints for all commands
  • Validates file paths before starting expensive operations (prevents wasted API tokens)
  • Clear error messages indicate what's wrong (e.g., "is a directory, expected a file")
  • Actionable hints suggest corrections (e.g., "Provide a file path: --output /path/output.md")
  • Applies to: plan, research, discover, review, interview, implement

Changed

• weld init now adds simple .weld/ entry to .gitignore instead of complex pattern
  • Previously used .weld/* with !.weld/config.toml exception to track config
  • Now ignores entire .weld/ directory (config is local-only)