docs: Prune documentation - DRY versioning, split roadmap

- Split roadmap into dedicated ROADMAP.md (links to phoebe tasks)
- Prune Endgame-Vision.md: roadmap section, links section, version history
- Standardize version footers: one-line format across 17+ files
- Add Navigation section pointing to README.md for file index

Pattern: **Version:** X.Y | **Created:** YYYY-MM-DD | **Updated:** YYYY-MM-DD

Git is the changelog. Philosophy quotes preserved.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

architecture/interfaces/Nimmerswarm-Interface.md

@@ -914,13 +914,10 @@ VIRTUAL                              REAL
 
 ---
 
-**File**: Nimmerswarm-Interface.md
-**Version**: 1.1
-**Created**: 2025-12-29
-**Updated**: 2025-12-29 (added dual-spectrum IR positioning, Low-Cost-Mocap reference)
-**Session**: Wild 5AM idea session + morning coffee session (dafit + Nyx)
-**Status**: Core concept, ready to branch
-**Philosophy**: "They see each other. They know themselves through the swarm."
-**Credits**: IR positioning architecture inspired by [Low-Cost-Mocap](https://github.com/jyjblrd/Low-Cost-Mocap) by @jyjblrd
+**Version:** 1.1 | **Created:** 2025-12-29 | **Updated:** 2025-12-29
+
+*"They see each other. They know themselves through the swarm."*
+
+IR positioning inspired by [Low-Cost-Mocap](https://github.com/jyjblrd/Low-Cost-Mocap)
 
 🦎✨🔵🟢🟠 *The light speaks. The swarm listens.*