v2026.10.9.1

## What's Changed
* feat(channels): ask before sharing a linked item with the channel by @404Wolf in https://github.com/macro-inc/macro/pull/7851
* chore(otel): duplicate dev telemetry to Grafana while preserving direct Datadog export by @404Wolf in https://github.com/macro-inc/macro/pull/7863
* Fix Grafana telemetry copies in the dev Worker runtime by @404Wolf in https://github.com/macro-inc/macro/pull/7873
* Provision Grafana dashboards and staged dev alert rules with Nix by @404Wolf in https://github.com/macro-inc/macro/pull/7868
* fix(channels): prevent Recent agent preview remount loop by @peterchinman in https://github.com/macro-inc/macro/pull/7872


**Full Changelog**: https://github.com/macro-inc/macro/compare/v2026.10.9.0...v2026.10.9.1