implement repo policies: Makefile, Dockerfile, CI, prettier, editorconfig, LICENSE

Add failure stories section to OPENCLAW_TRICKS.md covering 10 real production
failures and fixes from the first three weeks of operation.

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 4
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[Makefile]
+indent_style = tab