v4.26.0 — flag trivial delegations at the end of a run

Added

• Deterministic runs now surface trivial delegation decisions immediately. verdict.json
  carries a top-level advisory trivial boolean derived from the same shared diffstat rule as
  cli-dispatch-gain: a run is trivial only when insertions plus deletions are greater than zero
  and fewer than 50. Empty and missing diffstats remain non-trivial, and the signal never changes
  the runner's exit code or judges the work itself. When true, both Bash and PowerShell runners
  print one short inline-or-batch suggestion after the terminal summary and before the worktree
  note. The gain report's existing text and counts remain unchanged.