* feat: add session discussion panel seam
* fix: keep discussion iframe cookie-capable and changelog release-owned
* test: cover cookie-capable discussion iframe sandbox
* fix: stretch discussion panel host so the embed fills the rail
* fix: keep provider failures retryable and probe discussion availability before showing the action
* fix: block same-origin discussion embeds, show action on catalog sessions, close stale panel on reconnect
* fix: scope discussion probes and panel callbacks to the issuing connection
* fix: dedupe in-flight discussion probes per session
* fix: retry superseded discussion probes and key-scope panel results
* fix: regenerate Swift protocol models and extend advertised-method expectations
* style: format chat-pane-header
* fix: regenerate Kotlin protocol models and date discussion methods in the 2026.7 train
* chore: restore release-owned changelog to main state
* chore: keep changelog untouched relative to merge-base
197c4f5a04
