Add durable facts log

memory/facts.md

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+# Facts
+
+- Martin wants Telegram messages analyzed for durable knowledge.
+- Durable facts should be extracted as atomic, normalized statements.
+- Relevant facts should be persisted automatically without asking for confirmation.
+- Facts should be written to `memory/facts.md` and `memory/facts.jsonl`.
+- Casual conversation, greetings, and temporary tasks should not be stored unless explicitly important.
+- Consistency, deduplication, and clarity should be prioritized.