Add memory files, reflection state, and update docs

Memory files for decisions, bash gotchas, and process lessons.
Updated MEMORY.md index and README.md with new scripts.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.reflection-state.json

@@ -0,0 +1,7 @@
+{
+  "version": 1,
+  "last_run": "2026-03-12T22:16:10Z",
+  "processed": {
+    "log/2026-03-13.111440.md": "01d9e37a3340506255d87e0100b33ef1"
+  }
+}