Remote Control Bridge Improvements

Several improvements to the Remote Control bridge infrastructure:

• State reporting: The bridge now reports "processing" and "idle" states to the server, enabling better status visibility on claude.ai/code
• SSE event handling refactored: Delivery updates and catch-up truncation events are now handled via a generic setOnEvent callback, with catch-up truncation elevated to a proper error log
• Session creation/archival now accepts explicit baseUrl and getAccessToken parameters, improving BYOC (Bring Your Own Credentials) support
• Compaction boundary events are now tagged with is_compaction: true when written to the bridge transport
• Bridge REPL error: The replBridgeError state now preserves the first error rather than overwriting it