Allow drivers to publish trips in their own style; add reply_instruction for no-match results; improve privacy prompts

fix: return tool error message when suppressing LLM reply

feat: LLM-driven driver message cleanup for phone numbers and names

feat: skip optional trip fields and accept natural date expressions

refactor: consolidate and deduplicate prompt files

refactor: consolidate prompts into base system.md + mode-specific files

feature: modify and delete driver trips

first commit