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-create/SKILL.md

@@ -211,10 +211,8 @@ assert '$SESSION_NAME' in names, 'session not registered'
 print('OK:', names)
 "
 
-# 4. Optional: send a probe via tmux send-keys and capture-pane
-tmux send-keys -t "$SESSION_NAME" "" Enter
-sleep 2
-tmux capture-pane -t "$SESSION_NAME" -p -S -20
+# 4. Optional: check the TUI status via capture-pane
+tmux capture-pane -t "$SESSION_NAME" -p -S -20   # TUI ready = agent banner visible, no dialog text
 ```
 
 ## When NOT to use this skill