fix(skills): evidence-based prompt delivery (send_keys_safe) to end prompt-lock (FW-W2)

- Add send_keys_safe + quiescence/dialog-detection helpers to lib.sh:
  keys are sent on pane evidence, never fixed timers; distinct exit
  codes 1-4; dialogs are never blindly Enter-ed
- inject_instructions delegates to send_keys_safe; create --submit-job
  publishes a terminal error event on delivery failure (no zombie jobs)
- wait_for_tui_ready: drop dialog-ambiguous tokens, treat open dialogs
  as not-ready, return 1 on timeout instead of proceeding
- delegate-job wrapper: replace copy-pasted raw paste/C-m block with
  lib.sh send_keys_safe (restores single source of truth)
- resume: conditional signature-gated dialog handling replaces blind
  Enter/Down/Enter; stop --graceful delivers exitkey safely, fallback
  chain unchanged
- create SKILL: passive capture-pane probe instead of stray Enter
- Mark FW-W2 resolved; add 3-agent analysis/plan reports

.agents/skills/multi-agent-mux-resume/SKILL.md

@@ -148,12 +148,7 @@ case "$AGENT" in
     fi
     eval "$START_CMD"
     # auto-handle trust / bypass dialogs
-    sleep 5
-    tmux send-keys -t "$SESSION_NAME" Enter 2>/dev/null || true
-    sleep 3
-    tmux send-keys -t "$SESSION_NAME" Down 2>/dev/null || true
-    sleep 0.3
-    tmux send-keys -t "$SESSION_NAME" Enter 2>/dev/null || true
+    handle_startup_dialogs "$SESSION_NAME" 20
     ;;
   agy|hermes|cline)
     eval "tmux new-session -d -s \"$SESSION_NAME\" -x 140 -y 40 -c \"$WORKSPACE\" \"$CMD_FULL\""