Add v0.2.3 checksums

Bump version to 0.2.3

Merge pull request #3 from jeffhuen/feat/xpath-namespace-support

Fix formatting, remove unused node_prefix trait method (YAGNI)

Document XPath 1.0 known limitations in README

Implement namespace-aware QName and wildcard node test matching

Document namespace axis limitation (requires namespace node type)

Return explicit errors for id() and variable references

Implement namespace-uri() XPath function

Add node_namespace_uri and node_prefix to DocumentAccess trait

Add implementation plan for XPath namespace support (issue #2)

Add design doc for XPath namespace support and stub resolution

Bump version to 0.2.2

Refactor XPath evaluation, fix memory leaks, and resolve all clippy warnings

Add v0.2.1 checksums