Framework design upload

spec/memory-hierarchy.md

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+# Memory hierarchy (draft)
+
+## Tiers
+- Ephemeral context (prompt/session window)
+- Working memory (session state)
+- Episodic memory (event timeline)
+- Semantic memory (facts/documents)
+- Symbolic memory (rules/constraints)
+
+## Rules
+- commits are gated by policy
+- decay/retention is explicit
+- provenance links to commits
+