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

add driver name search for passengers

switch to driver immediately if account exists; only ask name on first time

suppress LLM text reply after search_trips sends trip cards

make trip search fields optional; update LLM prompts to search/book immediately with partial info

feat: send trip cards as individual messages and resolve trip_id from replies

refactor: consolidate and deduplicate prompt files

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

first commit