Rename PDP for to loops to include while

Author: synapticvoid

docs/pdp/PDP-007-for-keyword.md

@@ -0,0 +1,22 @@
+# PDP-007: Loops
+
+**Status:** Draft
+**Issues:** #7, #14, #48
+
+## Summary
+
+Add loop constructs to Pipe: `while` for condition-based looping and `for` for iteration over ranges and collections. This covers loop syntax, iteration protocol, break/continue semantics, and how loops interact with the type system and pipe operators.
+
+## Syntax
+
+```
+TODO
+```
+
+## Semantics
+
+TODO
+
+## Open Questions
+
+- TODO