ix-flow v0.3.1

Fix skill frontmatter parsing for Windows CRLF files. Preserve the line break before the closing delimiter so the final plain YAML value does not gain a carriage return. This restores exact external invariant-name registration and unquoted workflow-directory resolution.

LF and CRLF regression tests cover actual skill loading and provider execution. All 72 tests, lint, build and the production security audit pass. Update Zod to patched 4.6.7.