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Adds topic_memory_node to saltybot_social:
- Subscribes /social/conversation_text (String, JSON {person_id, text})
- Extracts keywords via stop-word filtered pipeline:
lowercase -> strip punctuation -> filter length/alpha -> remove
stop words -> deduplicate -> cap at max_keywords_per_msg
- Maintains per-person rolling topic history (PersonTopicMemory):
ordered list, dedup with recency promotion, capped at
max_topics_per_person, evicts oldest when full
- Prunes persons idle for > prune_after_s (default 30 min; 0=disabled)
- Publishes JSON on /saltybot/conversation_topics on each utterance:
{person_id, recent_topics (most-recent first), new_topics, ts}
- Enables recall like 'last time you mentioned X'
- 71/71 tests passing
Closes #299