Bash PostToolUse additionalContext is silently dropped by CC — encounters
are written to state but never surfaced. Fix with a two-phase approach:
- PostToolUse (Bash): detects error, writes encounter with announced:false
- UserPromptSubmit: fires on next user message, checks for unannounced
encounter, surfaces it once, marks announced:true so dedup loop breaks
Removes debug scaffolding and the format_encounter_message call from the
Bash hook (announcement is now fully owned by user-prompt-submit.py).
