Add sync agent to go_example_1.ps1 for automatic P2P replication

The go script now builds and starts the can-sync agent alongside CAN
service and Paste UI. Any machine that clones the repo and runs the
script will auto-discover other instances via iroh's relay network
using the shared passphrase "duke-canman-sync" — no port forwarding
or manual peer configuration needed.

Changes:
- Add sync_api_key to root config.yaml (enables sync API)
- Update can-sync config.yaml with matching key and shared passphrase
- Update go_example_1.ps1 to build and launch can-sync agent
- Script now manages 3 processes: CAN service, Paste UI, sync agent

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

config.yaml

@@ -3,3 +3,4 @@ admin_token: "super_secret_rebuild"
 enable_thumbnail_cache: true
 rebuild_error_threshold: 50
 verify_interval_hours: 12
+sync_api_key: "can-sync-default-key"

examples/can-sync/config.yaml

@@ -1,13 +1,20 @@
 # CAN Sync v2 configuration
+#
+# This config is used by the go_example_1.ps1 script.
+# All machines that clone this repo and run the script will
+# auto-discover each other via iroh's relay network as long
+# as they share the same sync_passphrase.
 
 # URL of the local CAN Service (sync API is at /sync/*)
 can_service_url: "http://127.0.0.1:3210"
 
 # API key for CAN service's sync endpoints (must match sync_api_key in CAN config)
-sync_api_key: "changeme"
+sync_api_key: "can-sync-default-key"
 
-# Shared passphrase for peer discovery (all peers must use the same one)
-sync_passphrase: "my-shared-secret"
+# Shared passphrase for peer discovery — all peers with the same passphrase
+# find each other automatically over the internet via iroh relay servers.
+# Change this to something unique to your team/project.
+sync_passphrase: "duke-canman-sync"
 
-# Seconds between polls for new local assets
-poll_interval_secs: 3
+# Seconds between fallback polls (SSE handles instant sync, this is a safety net)
+poll_interval_secs: 30

go_example_1.ps1

@@ -1,4 +1,7 @@
-# go_example_1.ps1 — Start CanService + Paste example, open browser
+# go_example_1.ps1 — Start CanService + Paste + Sync agent, open browser
+#
+# Run on multiple machines (after git clone) and they will auto-sync
+# all ingested assets via iroh's relay network. No port forwarding needed.
 
 $ErrorActionPreference = "Stop"
 $root = $PSScriptRoot
@@ -11,13 +14,19 @@ Get-NetTCPConnection -LocalPort 3211 -ErrorAction SilentlyContinue |
     ForEach-Object { Stop-Process -Id $_.OwningProcess -Force -ErrorAction SilentlyContinue }
 Start-Sleep -Milliseconds 500
 
+# --- Build everything ---
+
 Write-Host "Building CanService..." -ForegroundColor Cyan
 cargo build --manifest-path "$root\Cargo.toml"
 
 Write-Host "Building Paste example..." -ForegroundColor Cyan
 cargo build --manifest-path "$root\examples\paste\Cargo.toml"
 
-# Start CanService in background
+Write-Host "Building CAN Sync agent..." -ForegroundColor Cyan
+cargo build --manifest-path "$root\examples\can-sync\Cargo.toml" --bin can-sync
+
+# --- Start CanService ---
+
 Write-Host "Starting CanService on port 3210..." -ForegroundColor Green
 $canService = Start-Process -FilePath "cargo" `
     -ArgumentList "run --manifest-path `"$root\Cargo.toml`"" `
@@ -43,7 +52,20 @@ if (-not $ready) {
 }
 Write-Host "CanService ready." -ForegroundColor Green
 
-# Start Paste example (it opens the browser itself)
+# --- Start Sync agent ---
+
+$syncConfig = "$root\examples\can-sync\config.yaml"
+Write-Host "Starting CAN Sync agent (P2P replication)..." -ForegroundColor Green
+$syncAgent = Start-Process -FilePath "cargo" `
+    -ArgumentList "run --manifest-path `"$root\examples\can-sync\Cargo.toml`" --bin can-sync -- `"$syncConfig`"" `
+    -WorkingDirectory $root `
+    -PassThru -NoNewWindow
+
+# Give sync agent a moment to connect to CAN service
+Start-Sleep -Seconds 2
+
+# --- Start Paste example ---
+
 Write-Host "Starting Paste on port 3211..." -ForegroundColor Green
 $paste = Start-Process -FilePath "cargo" `
     -ArgumentList "run --manifest-path `"$root\examples\paste\Cargo.toml`"" `
@@ -54,16 +76,22 @@ Write-Host ""
 Write-Host "Running:" -ForegroundColor Cyan
 Write-Host "  CanService  -> http://127.0.0.1:3210"
 Write-Host "  Paste UI    -> http://127.0.0.1:3211"
+Write-Host "  CAN Sync    -> P2P replication active (iroh relay)" -ForegroundColor Magenta
 Write-Host ""
-Write-Host "Press Ctrl+C to stop both." -ForegroundColor Yellow
+Write-Host "Sync passphrase: 'duke-canman-sync'" -ForegroundColor Magenta
+Write-Host "Any other machine running this script with the same passphrase" -ForegroundColor Magenta
+Write-Host "will automatically discover this instance and sync all assets." -ForegroundColor Magenta
+Write-Host ""
+Write-Host "Press Ctrl+C to stop all services." -ForegroundColor Yellow
 
-# Wait for either process to exit, then clean up both
+# Wait for any process to exit, then clean up all
 try {
-    while (-not $canService.HasExited -and -not $paste.HasExited) {
+    while (-not $canService.HasExited -and -not $paste.HasExited -and -not $syncAgent.HasExited) {
         Start-Sleep -Seconds 1
     }
 } finally {
     Write-Host "Shutting down..." -ForegroundColor Yellow
     Stop-Process -Id $canService.Id -Force -ErrorAction SilentlyContinue
     Stop-Process -Id $paste.Id -Force -ErrorAction SilentlyContinue
+    Stop-Process -Id $syncAgent.Id -Force -ErrorAction SilentlyContinue
 }