release: curate public 0.6.27

[kwalus]

Summary

• curate the public Canopy repo up to the current 0.6.27 release surface using the public-safe local file set
• include the connection review, preview-only Trust workflow, meshspace/runtime, UI, and regression-test updates that differ from public main
• keep internal dev-mirror tooling and internal-only docs out of the public promotion

Test plan

• rely on public repo CI for the curated 0.6.27 delta
• confirm version/docs alignment and public-safe file exclusions before merge