zagent 0.0.225

• New DECSTBM scroll-margin writer for the TUI: on capable terminals the
  streaming transcript is pinned to a scroll region (ZAGENT_TUI_SCROLL,
  default auto with a terminal blocklist; pinned forces it, off
  restores the previous painter). Margins hug the transcript tail,
  resize-safe arming pre-scrolls overflow, and every unpin parks the
  cursor below the live region so erases never touch committed output.
• The terminal-replay oracle (replayTerminal) now backs the streaming
  journeys, so paint-path regressions are replayed byte-for-byte in the
  offline gate.
• Internal: a continuous real-user flock harness runs free-model
  opencode agents against packed zagent tarballs in disposable
  no-credential sandboxes to surface real-world breakage early.