Generalize migration guide for any GRASP implementation

- Rename guide: migrate-ngit-relay-to-ngit-grasp.md → migrate-to-ngit-grasp.md
- Remove ngit-relay and relay.ngit.dev specific references
- Use generic terminology: source/target relay, current implementation
- Add Compatibility section explaining requirements
- Update examples to be implementation-agnostic
- Update script comments to reference GRASP relay (not ngit-relay)
- Update README.md to link to the new guide

Scripts already work with any GRASP implementation via parameters.

1 files changed, 7 insertions, 7 deletions

diff --git a/docs/how-to/README.md b/docs/how-to/README.md
index ba58c08..f755be1 100644
--- a/docs/how-to/README.md
+++ b/docs/how-to/README.md
@@ -110,15 +110,15 @@ How-to guides are **recipes** that show you how to solve specific problems or ac
 
 ---
 
-### Migrate from ngit-relay
-**Status:** 🔜 Planned
+### [Migrate to ngit-grasp](migrate-to-ngit-grasp.md)
+**Status:** ✅ Available
 
-**Problem:** Switch from reference implementation  
+**Problem:** Switch from another GRASP implementation  
 **You'll learn:**
-- Export data from ngit-relay
-- Import to ngit-grasp
-- Update repository URLs
-- Verify migration
+- Analyze existing relay data
+- Identify repositories needing attention
+- Run migration analysis scripts
+- Plan and execute cutover
 
 ---