fix: map README links to actual filenames and update section READMEs

- Fix all broken links in root README (partner-channel-strategy → Ideal Customer Profile, etc.)
- Add code/ directory to repo structure tree
- Update status table: Legal ✅, MCP Server ✅ MVP
- Rewrite section READMEs with actual file inventories:
  docs/engineering/, docs/gtm/, docs/investors/, docs/legal/

docs/investors/README.md

@@ -1,5 +1,12 @@
-# Investors Folder — geolocal.io
+# Investors — geolocal.io
 
-Pitch materials, market sizing, competitive analysis, financial model sketches, and traction plan.
+Pitch materials, market sizing, financial model.
 
-Align everything to NORTH_STAR.md.
+## Files
+
+| File | Description |
+|------|-------------|
+| [Market Data & Analysis](./Market%20Data%20&%20Analysis.md) | $98.8B TAM, consumer AI adoption trends |
+| [Business and Financial Model](./Business%20and%20financial%20model.md) | Revenue model, unit economics, projections |
+
+Align everything to [NORTH_STAR.md](../../NORTH_STAR.md).