* feat(clients): gateway session groups, batch operations, session inspector, and new-session options
* chore(i18n): translate session management strings and regenerate catalogs
* chore(i18n): complete translation artifacts for session management strings
* fix(clients): fail closed when a transport cannot honor agent or base-ref session options
* fix(clients): authoritative agent identity for new-session parents and revision-keyed sidebar group refresh
* fix(clients): refetch session groups on remote catalog events and correct Swedish repository-root translation
* fix(clients): resilient new-session popover, revision-keyed group manager, and popover string translations
* fix(clients): scope reset fallback to plain new-session requests and revision-key the inspector groups
* fix(clients): reject empty agent catalogs and refresh sessions on remote group events
* refactor(clients): drop unused agents fetch wrapper and runtime memberwise init flagged by periphery
* chore(i18n): realign locale artifacts after rebase onto model-controls main
* chore(clients): split session creation into the session-actions extension and realign i18n after ask-user main rebase
* chore(i18n): resync derived artifacts after question-card main rebase
* feat(clients): session detail parity — row actions, unread auto-clear, and subagent tree in the native chat sidebar
* fix(clients): overlay pending explicit unread values over stale session snapshots
* chore(i18n): translate new session action strings and regenerate Apple/Android catalogs
* chore(clients): delete dead pin helper and worktree memberwise init
