v0.1.0

Initial release of actionable-errors.

Three-audience error framework for Python (stdlib only, zero deps):

• ActionableError dataclass with 8 domain-specific factories
• ErrorType(StrEnum) base categories, extensible via composition
• AIGuidance + Troubleshooting frozen dataclasses
• ToolResult typed envelope with .ok()/.fail() factories
• Credential sanitizer with 8 built-in regex patterns
• from_exception() auto-classifier

90 tests, 100% coverage.