* fix(mobile): survive connection-migration cutovers during worktree create
A worktree.create in flight when the mobile transport migrates (relay/direct
hand-off on shoddy cellular, relay lease rotation, relay recovery) rejects with
"RPC interrupted by connection migration" even though the host completed it —
leaving the Create Workspace modal stuck while the worktree exists on desktop.
A naive retry hits a name collision and spawns a duplicate.
Mirror the existing mobile terminal-create idempotency: worktree.create now
accepts an optional clientMutationId that the host dedupes (in-flight + brief
post-success TTL), and mobile mints one key per candidate name and re-issues
the create on a cutover so the retry reconciles instead of duplicating.
* fix(mobile): gate worktree cutover replay by capability
* fix(mobile): await worktree replay capability
e719ef1a57