Release v0.58.0

What's Changed

• fix(server): return 200 for HEAD requests instead of 404 by @suxiaohun in #937
• [mcp] document exported helper functions by @zbarsky-openai in #940
• fix(server): deliver request-scoped elicitation on the originating POST SSE stream by @Yusufihsangorgel in #933
• docs: bump CONTRIBUTING Go prerequisite to match go.mod (1.23 → 1.25) by @kobihikri in #929
• fix: rewrite draft-07 definitions refs when adopting them as $defs by @WilliamAGH in #950
• fix(server): flush final SSE response in handlePost by @vinayaksachdeva in #945
• Fix #943: refuse unsupported subscribe requests by @Abdullah-Builds in #946
• fix(mcp): preserve schema tags on nested fields by @ychampion in #920

New Contributors

• @zbarsky-openai made their first contribution in #940
• @kobihikri made their first contribution in #929
• @WilliamAGH made their first contribution in #950
• @vinayaksachdeva made their first contribution in #945
• @Abdullah-Builds made their first contribution in #946
• @ychampion made their first contribution in #920

Full Changelog: v0.57.0...v0.58.0