v0.13.0

What's Changed

• docs: clarify trusted publishing release runbook by @astro-stack in #48
• docs: update copyright year to 2026 by @astro-stack in #49
• chore: establish repository governance by @astro-stack in #50
• ci: add gradual pull request quality gates by @astro-stack in #51
• ci: add safe scheduled maintenance checks by @astro-stack in #53
• feat: add neutral Evidence API contract by @astro-stack in #54
• feat: expose capture health through MCP by @astro-stack in #55
• fix: isolate request correlation across async tasks by @astro-stack in #56
• fix: route MCP request detail through Evidence API by @astro-stack in #57
• feat: add evidence-backed investigation guide by @astro-stack in #58
• feat: add safe agent fix handoff by @astro-stack in #59
• chore: prepare v0.13.0 release by @astro-stack in #60

Full Changelog: v0.12.3...v0.13.0