feat: extend the sidecar-first herdr dispatch policy to review and triage

Changed

• The <slug>.report.json sidecar-first dispatch policy (already used for the crew-coder
  worker) now also covers the reviewer and triage agents. dispatchViaHerdr checks each
  role's report file before scraping the pane at all: the review and triage prompts now name
  a reportPath and instruct the agent to write its verdict there as its last action, falling
  back to the same fenced-json-in-prose reply only if that file never lands.
  parseReviewReport/parseTriageReport accept the parsed sidecar and prefer it over the
  captured text entirely, same policy parseWorkerReport already had. Closes the same class of
  herdr read-capture failure (empty/garbled pane render) for review and triage that the worker
  fix already closed — a genuine verdict no longer depends on a terminal scrape succeeding.