Update docs/build-notes.md

Document Fulcrum connectivity milestone

docs/build-notes.md

@@ -6,25 +6,57 @@
 
 ## Completed
 
-- StartOS package builds successfully
-- Docker container starts correctly
-- Service installs on physical StartOS server
-- Web interface is served by nginx
-- UTF-8 support verified
-- Repository cleaned and structured
+### Milestone 1 — Working StartOS service
+
+* StartOS package builds successfully
+* Docker container starts correctly
+* Service installs on physical StartOS server
+* Web interface is served by nginx
+* UTF-8 support verified
+* Repository cleaned and structured
+
+### Milestone 2 — Fulcrum connectivity and live service status
+
+* Fulcrum is configured as a StartOS dependency
+* Munin receives the Fulcrum endpoint from StartOS
+* Munin performs a real Electrum `server.version` connectivity check
+* Status API reports Fulcrum configuration and connection state
+* Verified status API response with `fulcrum.connected: true`
+* Web interface displays `Fulcrum (Electrum server)`
+* Web interface displays the Fulcrum connection status and endpoint
+* Web interface displays wallet, label, transaction, and last-scan status
+* Status can be refreshed from the web interface
+* TypeScript check passes
+* JavaScript bundle builds successfully
+* Docker image builds successfully
+* S9PK package builds successfully
+* S9PK package was sideloaded and installed on the physical StartOS server
+* Munin starts successfully after installation
 
 ## Current architecture
 
-- StartOS package
-- Alpine Linux container
-- nginx serving static files
-- Static dashboard in `web/index.html`
+* StartOS package
+* Alpine Linux container
+* nginx serving the web interface
+* Node.js status API
+* Static dashboard in `web/index.html`
+* Fulcrum provided as a StartOS dependency
+* Electrum protocol connectivity check from Munin to Fulcrum
+
+## Current status
+
+Munin Bitcoin is running as a StartOS service and can verify connectivity to the configured Fulcrum Electrum server.
+
+Bitcoin Core RPC is not currently used by Munin.
+
+Wallet configuration, label storage, transaction scanning, and notification functionality are not yet implemented.
 
 ## Next steps
 
-- Read service status from backend
-- Connect to Bitcoin Core RPC
-- Add persistent storage
-- Add wallet configuration
-- Add BIP-329 support
-- Display live status in the web interface
+* Add persistent storage
+* Add wallet configuration
+* Add BIP-329 support
+* Add wallet/address scanning
+* Add transaction monitoring
+* Display live wallet and transaction data in the web interface
+* Add transaction notifications with label reminders