Fix production-sync-testing.md guide and sanitize-logs.sh script

- Fix shebang in sanitize-logs.sh from #!/bin/bash to #!/usr/bin/env bash for NixOS compatibility
- Update sanitizer defaults from 100/20 to 200/100 chars for better log readability
- Fix CLI argument names in guide: --sync-bootstrap-relay -> --sync-bootstrap-relay-url
- Fix CLI argument names in guide: --git-path -> --git-data-path

These issues were discovered during first-time testing of the production sync testing guide.

2 files changed, 14 insertions, 14 deletions

diff --git a/docs/how-to/production-sync-testing.md b/docs/how-to/production-sync-testing.md
index dfff20d..a55e9ea 100644
--- a/docs/how-to/production-sync-testing.md
+++ b/docs/how-to/production-sync-testing.md
@@ -38,7 +38,7 @@ This domain has few repo announcements listing it, so sync stays manageable.
 The bootstrap relay provides the initial set of announcements to discover repos:
 
 ```bash
---sync-bootstrap-relay wss://git.shakespeare.diy
+--sync-bootstrap-relay-url wss://git.shakespeare.diy
 ```
 
 ### 3. Run with Time Limit
@@ -51,9 +51,9 @@ rm -rf /tmp/ngit-test-*
 
 # Run for 30 seconds with sanitized output
 timeout 30s cargo run -- \
-    --sync-bootstrap-relay wss://git.shakespeare.diy \
+    --sync-bootstrap-relay-url wss://git.shakespeare.diy \
     --domain ngit.danconwaydev.com \
-    --git-path /tmp/ngit-test-git \
+    --git-data-path /tmp/ngit-test-git \
     --relay-data-path /tmp/ngit-test-relay \
     2>&1 | ./scripts/sanitize-logs.sh | tee sync-test.log
 ```
@@ -72,8 +72,8 @@ cargo run -- [args] 2>&1 | ./scripts/sanitize-logs.sh
 ```
 
 **Options:**
-- `--head-chars N` - First N characters to show (default: 100)
-- `--tail-chars N` - Last N characters to show (default: 20)
+- `--head-chars N` - First N characters to show (default: 200)
+- `--tail-chars N` - Last N characters to show (default: 100)
 
 Example output:
 ```
@@ -245,9 +245,9 @@ tracing::trace!("Per-event detail that's too noisy");
 
 ```bash
 timeout 30s cargo run -- \
-    --sync-bootstrap-relay wss://git.shakespeare.diy \
+    --sync-bootstrap-relay-url wss://git.shakespeare.diy \
     --domain ngit.danconwaydev.com \
-    --git-path /tmp/ngit-test-git \
+    --git-data-path /tmp/ngit-test-git \
     --relay-data-path /tmp/ngit-test-relay \
     2>&1 | ./scripts/sanitize-logs.sh
 ```
@@ -256,9 +256,9 @@ timeout 30s cargo run -- \
 
 ```bash
 timeout 30s cargo run -- \
-    --sync-bootstrap-relay wss://git.shakespeare.diy \
+    --sync-bootstrap-relay-url wss://git.shakespeare.diy \
     --domain ngit.danconwaydev.com \
-    --git-path /tmp/ngit-test-git \
+    --git-data-path /tmp/ngit-test-git \
     --relay-data-path /tmp/ngit-test-relay \
     --metrics-address 127.0.0.1:9090 \
     2>&1 | ./scripts/sanitize-logs.sh
diff --git a/scripts/sanitize-logs.sh b/scripts/sanitize-logs.sh
index 123e72c..7225fe4 100755
--- a/scripts/sanitize-logs.sh
+++ b/scripts/sanitize-logs.sh
@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/usr/bin/env bash
 # sanitize-logs.sh - Truncates verbose log lines for LLM analysis
 #
 # Usage:
@@ -9,8 +9,8 @@
 set -euo pipefail
 
 # Default settings
-HEAD_CHARS=100
-TAIL_CHARS=20
+HEAD_CHARS=200
+TAIL_CHARS=100
 MAX_LINE_LENGTH=$((HEAD_CHARS + TAIL_CHARS + 20))  # buffer for the ellipsis marker
 
 # Parse arguments
@@ -35,8 +35,8 @@ while [[ $# -gt 0 ]]; do
             echo "Reads from stdin, writes to stdout."
             echo ""
             echo "Options:"
-            echo "  --head-chars N    Show first N chars of long lines (default: 100)"
-            echo "  --tail-chars N    Show last N chars of long lines (default: 20)"
+            echo "  --head-chars N    Show first N chars of long lines (default: 200)"
+            echo "  --tail-chars N    Show last N chars of long lines (default: 100)"
             echo "  --max-line N      Lines shorter than this are unchanged (default: head+tail+20)"
             echo "  -h, --help        Show this help"
             echo ""