v0.5.0-rc.11

What's Changed

• feat(agentmail): rebuild provider-native mailbox orchestration by @mhofwell in #208
• fix(release): preserve AgentMail canary secret contract by @mhofwell in #209
• test(release): add live AgentMail mutation canary by @mhofwell in #210
• fix(release): honor AgentMail canary list policy by @mhofwell in #211
• test(release): isolate AgentMail live E2E stages by @mhofwell in #212
• test(release): trace AgentMail delivery telemetry by @mhofwell in #213
• release: v0.5.0-rc.11 by @mhofwell in #214
• fix(agentmail): accept opaque provider identifiers by @mhofwell in #215
• test(release): trust canonical AgentMail delivery proof by @mhofwell in #216
• test(release): verify reviewed reply content by @mhofwell in #217

Full Changelog: v0.5.0-rc.10...v0.5.0-rc.11