docs(planning): clean up next milestone document and remove completion markers

- Remove excessive completion checkmarks and status markers throughout document
- Consolidate redundant sections on completed features
- Streamline executive summary and current status sections
- Focus content on upcoming quick wins and active tasks
- Remove duplicate phase completion listings
- Clean up success metrics and KPI sections
- Maintain essential planning information while reducing noise

docs/implementation/README.md

@@ -0,0 +1,20 @@
+# Implementation Documentation
+
+**Generated**: 2026-03-08 13:06:38
+**Total Files**: 1
+**Documented Files**: 0
+**Other Files**: 1
+
+## Documented Files (Converted from Analysis)
+
+
+## Other Documentation Files
+
+- [Implementation Documentation](README.md)
+
+
+## Category Overview
+This section contains all documentation related to implementation documentation. The documented files have been automatically converted from completed planning analysis files.
+
+---
+*Auto-generated index*