perf: keywords nodes use Pydantic structured output

perf: keywords nodes do not use Pydantic structured output

perf: keywords nodes do not use Pydantic structured output

perf: migrate keywords node to Pydantic structured output for complete recall and zero conversational noise

fix: enforce 'NONE' responses to stop conversational pollution in invalid keywords

perf: strip definitions from prompt token context to clear 429 rate limit errors

fix: match verbatim notebook configuration and extract raw keywords with UI formatting

feat: add topic prepending and expose invalid keywords output

fix: align prompt instructions with notebook index path prefixing

deploy multi-topic parallel langgraph pipeline

initial commit