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/formalization/Lifeforce-Dynamics.md

@@ -515,14 +515,7 @@ The feedback loop ensures stability: low lifeforce reduces expenditure, raising
 
 ## Document Status
 
-**Version**: 1.1
-**Created**: 2025-12-29
-**Updated**: 2025-12-29 (added reward-based income sources)
-**Authors**: Chrysalis-Nyx & dafit (Partnership)
-
-**Formalizes**:
-- Big-Picture.md sections on Lifeforce Economy, Slumber/Wake, Math Cells
-- Reward system from Cellular-Architecture.md
+**Version:** 1.1 | **Created:** 2025-12-29 | **Updated:** 2025-12-29
 - Discovery economics from Discovery-Scan-Station.md
 
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