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.

10 files changed, 90 insertions, 73 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
 
 ---
 
diff --git a/docs/how-to/migrate-ngit-relay-to-ngit-grasp.md b/docs/how-to/migrate-to-ngit-grasp.md
index 975eb4c..f4dff86 100644
--- a/docs/how-to/migrate-ngit-relay-to-ngit-grasp.md
+++ b/docs/how-to/migrate-to-ngit-grasp.md
@@ -1,6 +1,21 @@
-# Migrate ngit-relay to ngit-grasp
+# Migrate to ngit-grasp from another GRASP implementation
 
-This guide walks you through migrating a production ngit-relay instance to ngit-grasp. The process involves analyzing your existing data to identify repositories that need attention before switching over.
+This guide walks you through migrating a production GRASP relay to ngit-grasp. The process involves analyzing your existing data to identify repositories that need attention before switching over.
+
+## Compatibility
+
+This migration process works with any GRASP implementation that:
+
+- Stores git data in the `<npub>/<identifier>.git` directory structure
+- Uses standard GRASP events (kind 30617 announcements, kind 30618 state, kind 5 deletions)
+- Exposes a Nostr relay WebSocket endpoint
+
+**Known compatible implementations:**
+- ngit-relay (reference implementation)
+- ngit-grasp (when migrating between instances or from archive mode)
+- Other GRASP-compliant relays following the specification
+
+The migration scripts analyze Nostr events and git data directly, making them implementation-agnostic.
 
 ## Quick Start
 
@@ -9,15 +24,15 @@ Run the migration analysis with a single command:
 ```bash
 # Basic analysis (fetches events, compares relays)
 ./docs/how-to/migration-scripts/run-migration-analysis.sh \
-  --prod-relay wss://relay.ngit.dev \
-  --archive-relay wss://archive.relay.ngit.dev
+  --prod-relay wss://source-relay.example.com \
+  --archive-relay wss://target-relay.example.com
 
 # Full analysis (includes git sync check - run on VPS)
 ./docs/how-to/migration-scripts/run-migration-analysis.sh \
-  --prod-relay wss://relay.ngit.dev \
-  --archive-relay wss://archive.relay.ngit.dev \
-  --prod-git /var/lib/ngit-relay/git \
-  --archive-git /var/lib/ngit-relay-archive/git \
+  --prod-relay wss://source-relay.example.com \
+  --archive-relay wss://target-relay.example.com \
+  --prod-git /var/lib/grasp-relay/git \
+  --archive-git /var/lib/ngit-grasp/git \
   --service ngit-grasp.service
 ```
 
@@ -37,7 +52,7 @@ See [Running the Analysis](#running-the-analysis) for detailed options.
 
 ### For Full Analysis (VPS)
 
-- SSH access to the VPS running ngit-relay
+- SSH access to the VPS running your source relay
 - Read access to git data directories
 - Access to systemd journal (for log extraction)
 
@@ -58,7 +73,7 @@ The migration process has three stages:
 
 ### Stage 1: Deploy Archive Instance
 
-Deploy ngit-grasp alongside your production ngit-relay:
+Deploy ngit-grasp alongside your production relay:
 
 1. Configure ngit-grasp with:
    - `domain` set to `<prod-domain>.internal` (temporary)
@@ -88,24 +103,24 @@ Once all issues are resolved:
 ```bash
 # Preview what will happen (dry run)
 ./run-migration-analysis.sh \
-  --prod-relay wss://relay.ngit.dev \
-  --archive-relay wss://archive.relay.ngit.dev \
+  --prod-relay wss://source-relay.example.com \
+  --archive-relay wss://target-relay.example.com \
   --dry-run
 
 # Run the analysis
 ./run-migration-analysis.sh \
-  --prod-relay wss://relay.ngit.dev \
-  --archive-relay wss://archive.relay.ngit.dev
+  --prod-relay wss://source-relay.example.com \
+  --archive-relay wss://target-relay.example.com
 ```
 
 ### Full Analysis on VPS
 
 ```bash
 ./run-migration-analysis.sh \
-  --prod-relay wss://relay.ngit.dev \
-  --archive-relay wss://archive.relay.ngit.dev \
-  --prod-git /var/lib/ngit-relay/git \
-  --archive-git /var/lib/ngit-relay-archive/git \
+  --prod-relay wss://source-relay.example.com \
+  --archive-relay wss://target-relay.example.com \
+  --prod-git /var/lib/grasp-relay/git \
+  --archive-git /var/lib/ngit-grasp/git \
   --service ngit-grasp.service
 ```
 
@@ -128,8 +143,8 @@ Skip or run specific phases:
 
 | Option | Description |
 |--------|-------------|
-| `--prod-relay <url>` | Production relay WebSocket URL (required) |
-| `--archive-relay <url>` | Archive relay WebSocket URL (required) |
+| `--prod-relay <url>` | Source relay WebSocket URL (required) |
+| `--archive-relay <url>` | Target relay WebSocket URL (required) |
 | `--prod-git <path>` | Git base directory for prod (enables Phase 2) |
 | `--archive-git <path>` | Git base directory for archive (enables Phase 2) |
 | `--service <name>` | Systemd service name (enables Phase 4) |
@@ -217,7 +232,7 @@ Run with sudo or ensure your user has read access:
 
 ```bash
 # Check permissions
-ls -la /var/lib/ngit-relay/git
+ls -la /var/lib/grasp-relay/git
 
 # Run with sudo if needed
 sudo ./run-migration-analysis.sh ...
@@ -332,16 +347,18 @@ work/migration-analysis-YYYYMMDD-HHMM/
     └── summary.txt                 # Phase 5
 ```
 
-## Key Differences: ngit-relay vs ngit-grasp
+## Why Migration May Require Attention
+
+Different GRASP implementations may handle edge cases differently. ngit-grasp has stricter validation and better observability, which can surface issues that were previously hidden:
 
-Understanding these differences helps explain why some repositories need attention:
+| Aspect | Typical Source Relay | ngit-grasp |
+|--------|---------------------|------------|
+| Git data validation | May accept partial data | Requires all git data to reproduce state |
+| PR refs cleanup | May not clear `refs/nostr/<event-id>` | Properly manages PR refs |
+| Parse failures | May silently ignore | Logs structured `[PARSE_FAIL]` entries |
+| Sync timeout | May have no timeout | Purgatory expires after configurable period |
 
-| Aspect | ngit-relay | ngit-grasp |
-|--------|------------|------------|
-| Git data validation | Accepts commits/tags referenced in state event | Requires all git data to reproduce state |
-| PR refs cleanup | Doesn't clear `refs/nostr/<event-id>` | Properly manages PR refs |
-| Parse failures | Silently ignores | Logs structured `[PARSE_FAIL]` entries |
-| Sync timeout | No timeout | Purgatory expires after configurable period |
+These differences explain why some repositories may need attention during migration - ngit-grasp's stricter validation catches issues that other implementations may have silently accepted.
 
 ## Next Steps
 
@@ -371,10 +388,10 @@ For advanced usage, you can run individual phase scripts:
 
 ```bash
 # Phase 1: Fetch events
-./migration-scripts/01-fetch-events.sh wss://relay.ngit.dev output/prod
+./migration-scripts/01-fetch-events.sh wss://source-relay.example.com output/prod
 
 # Phase 2: Git sync check
-./migration-scripts/10-check-git-sync.sh output/prod/raw/state-events.json /var/lib/ngit-relay/git output/prod --categorize
+./migration-scripts/10-check-git-sync.sh output/prod/raw/state-events.json /var/lib/grasp-relay/git output/prod --categorize
 
 # Phase 3a: Categorize
 ./migration-scripts/20-categorize.sh output/prod/git-sync-status.tsv output/prod
diff --git a/docs/how-to/migration-scripts/01-fetch-events.sh b/docs/how-to/migration-scripts/01-fetch-events.sh
index 6870659..e0d6f26 100755
--- a/docs/how-to/migration-scripts/01-fetch-events.sh
+++ b/docs/how-to/migration-scripts/01-fetch-events.sh
@@ -2,7 +2,7 @@
 #
 # 01-fetch-events.sh - Fetch nostr events from a relay for migration analysis
 #
-# PHASE 1 of the ngit-relay to ngit-grasp migration analysis pipeline.
+# PHASE 1 of the GRASP relay to ngit-grasp migration analysis pipeline.
 # Fetches kind 30618 (state), 30617 (announcement), and 5 (deletion) events.
 #
 # USAGE:
@@ -41,7 +41,7 @@
 #   - Run Phase 1 and Phase 2 back-to-back for accurate snapshot
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #
 
 set -euo pipefail
diff --git a/docs/how-to/migration-scripts/10-check-git-sync.sh b/docs/how-to/migration-scripts/10-check-git-sync.sh
index 493d50a..1f2ce04 100755
--- a/docs/how-to/migration-scripts/10-check-git-sync.sh
+++ b/docs/how-to/migration-scripts/10-check-git-sync.sh
@@ -2,21 +2,21 @@
 #
 # 10-check-git-sync.sh - Compare state events to actual git data on disk
 #
-# PHASE 2 of the ngit-relay to ngit-grasp migration analysis pipeline.
+# PHASE 2 of the GRASP relay to ngit-grasp migration analysis pipeline.
 # Compares kind 30618 state events against actual git refs on disk.
 #
 # USAGE:
 #   ./10-check-git-sync.sh <state-events.json> <git-base-dir> <output-dir> [--categorize]
 #
 # EXAMPLES:
-#   # Check prod relay against prod git data
-#   ./10-check-git-sync.sh output/prod/raw/state-events.json /var/lib/ngit-relay/git output/prod
+#   # Check source relay against source git data
+#   ./10-check-git-sync.sh output/prod/raw/state-events.json /var/lib/grasp-relay/git output/prod
 #
-#   # Check archive relay against archive git data
-#   ./10-check-git-sync.sh output/archive/raw/state-events.json /var/lib/ngit-relay-archive/git output/archive
+#   # Check target relay against target git data
+#   ./10-check-git-sync.sh output/archive/raw/state-events.json /var/lib/ngit-grasp/git output/archive
 #
 #   # Check and categorize in one step (convenience mode)
-#   ./10-check-git-sync.sh output/prod/raw/state-events.json /var/lib/ngit-relay/git output/prod --categorize
+#   ./10-check-git-sync.sh output/prod/raw/state-events.json /var/lib/grasp-relay/git output/prod --categorize
 #
 # INPUT:
 #   state-events.json  - JSONL file from Phase 1 (01-fetch-events.sh)
@@ -53,7 +53,7 @@
 #   - Handles packed refs (git show-ref) and loose refs
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #   01-fetch-events.sh - Phase 1 script that produces input for this script
 #   20-categorize.sh - Phase 3a script that consumes output from this script
 #
@@ -101,13 +101,13 @@ usage() {
     echo ""
     echo "Arguments:"
     echo "  state-events.json  JSONL file from Phase 1 (kind 30618 events)"
-    echo "  git-base-dir       Base directory for git repos (e.g., /var/lib/ngit-relay/git)"
+    echo "  git-base-dir       Base directory for git repos (e.g., /var/lib/grasp-relay/git)"
     echo "  output-dir         Directory to store output files"
     echo "  --categorize       Optional: also output category files (like Phase 3)"
     echo ""
     echo "Examples:"
-    echo "  $0 output/prod/raw/state-events.json /var/lib/ngit-relay/git output/prod"
-    echo "  $0 output/archive/raw/state-events.json /var/lib/ngit-relay-archive/git output/archive"
+    echo "  $0 output/prod/raw/state-events.json /var/lib/grasp-relay/git output/prod"
+    echo "  $0 output/archive/raw/state-events.json /var/lib/ngit-grasp/git output/archive"
     echo ""
     echo "Output:"
     echo "  git-sync-status.tsv - TSV with: repo, npub, state_refs, git_refs, matches, reason"
diff --git a/docs/how-to/migration-scripts/20-categorize.sh b/docs/how-to/migration-scripts/20-categorize.sh
index f47eb55..b38dc00 100755
--- a/docs/how-to/migration-scripts/20-categorize.sh
+++ b/docs/how-to/migration-scripts/20-categorize.sh
@@ -2,7 +2,7 @@
 #
 # 20-categorize.sh - Categorize git sync status into 4 categories
 #
-# PHASE 3a of the ngit-relay to ngit-grasp migration analysis pipeline.
+# PHASE 3a of the GRASP relay to ngit-grasp migration analysis pipeline.
 # Takes git-sync-status.tsv from Phase 2 and categorizes into 4 files.
 #
 # USAGE:
@@ -39,7 +39,7 @@
 # RUNTIME: < 1 second (local processing only)
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #   10-check-git-sync.sh - Phase 2 script that produces input for this script
 #
 
diff --git a/docs/how-to/migration-scripts/21-compare-relays.sh b/docs/how-to/migration-scripts/21-compare-relays.sh
index 6b40dc8..b9c0d30 100755
--- a/docs/how-to/migration-scripts/21-compare-relays.sh
+++ b/docs/how-to/migration-scripts/21-compare-relays.sh
@@ -2,7 +2,7 @@
 #
 # 21-compare-relays.sh - Compare prod vs archive category files to find gaps
 #
-# PHASE 3b of the ngit-relay to ngit-grasp migration analysis pipeline.
+# PHASE 3b of the GRASP relay to ngit-grasp migration analysis pipeline.
 # Compares categorized output from prod and archive to identify:
 # - Repos complete in prod but missing/incomplete in archive
 # - Repos in archive but not in prod
@@ -39,7 +39,7 @@
 # RUNTIME: < 1 second (local processing only)
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #   20-categorize.sh - Phase 3a script that produces input for this script
 #
 
diff --git a/docs/how-to/migration-scripts/30-extract-parse-failures.sh b/docs/how-to/migration-scripts/30-extract-parse-failures.sh
index 753fd3e..bc2049a 100755
--- a/docs/how-to/migration-scripts/30-extract-parse-failures.sh
+++ b/docs/how-to/migration-scripts/30-extract-parse-failures.sh
@@ -2,7 +2,7 @@
 #
 # 30-extract-parse-failures.sh - Extract parse failure events from systemd logs
 #
-# PHASE 4a of the ngit-relay to ngit-grasp migration analysis pipeline.
+# PHASE 4a of the GRASP relay to ngit-grasp migration analysis pipeline.
 # Extracts structured [PARSE_FAIL] log entries from journalctl.
 #
 # USAGE:
@@ -42,7 +42,7 @@
 #   [PARSE_FAIL] log entries. Until those are implemented, this script will
 #   find no matching entries (which is handled gracefully).
 #
-#   See: docs/how-to/migrate-ngit-relay-to-ngit-grasp.md (Dependencies section)
+#   See: docs/how-to/migrate-to-ngit-grasp.md (Dependencies section)
 #
 #   Expected Rust logging code:
 #     tracing::warn!(
@@ -59,7 +59,7 @@
 # RUNTIME: Depends on log volume, typically < 30 seconds
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #   31-extract-purgatory-expiry.sh - Companion script for purgatory expiry logs
 #
 
@@ -231,7 +231,7 @@ main() {
         if [[ "$sample_count" -eq 0 ]]; then
             log_warn "No [PARSE_FAIL] entries found in logs."
             log_warn "This is expected if ngit-grasp logging improvements are not yet deployed."
-            log_warn "See: docs/how-to/migrate-ngit-relay-to-ngit-grasp.md (Dependencies section)"
+            log_warn "See: docs/how-to/migrate-to-ngit-grasp.md (Dependencies section)"
         fi
         
         exit 0
@@ -259,7 +259,7 @@ main() {
         log_warn ""
         log_warn "  [PARSE_FAIL] kind=30618 event_id=abc123 reason=\"...\" repo=myrepo npub=npub1..."
         log_warn ""
-        log_warn "See: docs/how-to/migrate-ngit-relay-to-ngit-grasp.md (Dependencies section)"
+        log_warn "See: docs/how-to/migrate-to-ngit-grasp.md (Dependencies section)"
         log_warn ""
         
         # Create empty output file with header comment
diff --git a/docs/how-to/migration-scripts/31-extract-purgatory-expiry.sh b/docs/how-to/migration-scripts/31-extract-purgatory-expiry.sh
index 38b2ca3..8cadad9 100755
--- a/docs/how-to/migration-scripts/31-extract-purgatory-expiry.sh
+++ b/docs/how-to/migration-scripts/31-extract-purgatory-expiry.sh
@@ -2,7 +2,7 @@
 #
 # 31-extract-purgatory-expiry.sh - Extract purgatory expiry events from systemd logs
 #
-# PHASE 4b of the ngit-relay to ngit-grasp migration analysis pipeline.
+# PHASE 4b of the GRASP relay to ngit-grasp migration analysis pipeline.
 # Extracts structured [PURGATORY_EXPIRED] log entries from journalctl.
 #
 # USAGE:
@@ -53,7 +53,7 @@
 #   [PURGATORY_EXPIRED] log entries. Until those are implemented, this script
 #   will find no matching entries (which is handled gracefully).
 #
-#   See: docs/how-to/migrate-ngit-relay-to-ngit-grasp.md (Dependencies section)
+#   See: docs/how-to/migrate-to-ngit-grasp.md (Dependencies section)
 #
 #   Expected Rust logging code:
 #     tracing::warn!(
@@ -70,7 +70,7 @@
 # RUNTIME: Depends on log volume, typically < 30 seconds
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #   30-extract-parse-failures.sh - Companion script for parse failure logs
 #
 
@@ -238,7 +238,7 @@ main() {
         if [[ "$sample_count" -eq 0 ]]; then
             log_warn "No [PURGATORY_EXPIRED] entries found in logs."
             log_warn "This is expected if ngit-grasp logging improvements are not yet deployed."
-            log_warn "See: docs/how-to/migrate-ngit-relay-to-ngit-grasp.md (Dependencies section)"
+            log_warn "See: docs/how-to/migrate-to-ngit-grasp.md (Dependencies section)"
         fi
         
         exit 0
@@ -266,7 +266,7 @@ main() {
         log_warn ""
         log_warn "  [PURGATORY_EXPIRED] repo=myrepo npub=npub1... reason=\"...\""
         log_warn ""
-        log_warn "See: docs/how-to/migrate-ngit-relay-to-ngit-grasp.md (Dependencies section)"
+        log_warn "See: docs/how-to/migrate-to-ngit-grasp.md (Dependencies section)"
         log_warn ""
         
         # Create empty output file with header comment
diff --git a/docs/how-to/migration-scripts/40-classify-actions.sh b/docs/how-to/migration-scripts/40-classify-actions.sh
index 9fc718f..1706e47 100755
--- a/docs/how-to/migration-scripts/40-classify-actions.sh
+++ b/docs/how-to/migration-scripts/40-classify-actions.sh
@@ -2,7 +2,7 @@
 #
 # 40-classify-actions.sh - Final classification of repos for migration action
 #
-# PHASE 5 of the ngit-relay to ngit-grasp migration analysis pipeline.
+# PHASE 5 of the GRASP relay to ngit-grasp migration analysis pipeline.
 # Combines all data sources from previous phases to produce actionable results.
 #
 # USAGE:
@@ -82,7 +82,7 @@
 # RUNTIME: < 5 seconds (local processing only)
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #   01-fetch-events.sh - Phase 1 (fetch events)
 #   10-check-git-sync.sh - Phase 2 (git sync check)
 #   20-categorize.sh, 21-compare-relays.sh - Phase 3 (categorize and compare)
diff --git a/docs/how-to/migration-scripts/run-migration-analysis.sh b/docs/how-to/migration-scripts/run-migration-analysis.sh
index 2ba25ab..84aec2a 100755
--- a/docs/how-to/migration-scripts/run-migration-analysis.sh
+++ b/docs/how-to/migration-scripts/run-migration-analysis.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# run-migration-analysis.sh - Orchestrate the complete ngit-relay to ngit-grasp migration analysis
+# run-migration-analysis.sh - Orchestrate the complete GRASP relay to ngit-grasp migration analysis
 #
 # This script runs all 5 phases of the migration analysis pipeline in sequence,
 # with proper error handling, progress reporting, and timing information.
@@ -13,8 +13,8 @@
 #   ./run-migration-analysis.sh \
 #     --prod-relay wss://relay.ngit.dev \
 #     --archive-relay wss://archive.relay.ngit.dev \
-#     --prod-git /var/lib/ngit-relay/git \
-#     --archive-git /var/lib/ngit-relay-archive/git
+#     --prod-git /var/lib/grasp-relay/git \
+#     --archive-git /var/lib/ngit-grasp/git
 #
 # USAGE:
 #   ./run-migration-analysis.sh [options]
@@ -64,12 +64,12 @@
 #   ./run-migration-analysis.sh \
 #     --prod-relay wss://relay.ngit.dev \
 #     --archive-relay wss://archive.relay.ngit.dev \
-#     --prod-git /var/lib/ngit-relay/git \
-#     --archive-git /var/lib/ngit-relay-archive/git \
+#     --prod-git /var/lib/grasp-relay/git \
+#     --archive-git /var/lib/ngit-grasp/git \
 #     --service ngit-grasp.service
 #
 # SEE ALSO:
-#   docs/how-to/migrate-ngit-relay-to-ngit-grasp.md - Full migration guide
+#   docs/how-to/migrate-to-ngit-grasp.md - Full migration guide
 #
 
 set -euo pipefail
@@ -658,7 +658,7 @@ display_summary() {
 main() {
     parse_args "$@"
     
-    log_header "ngit-relay to ngit-grasp Migration Analysis"
+    log_header "GRASP Relay to ngit-grasp Migration Analysis"
     
     validate_args
     check_prerequisites