Restored workspace history on connect so existing sessions catch up before live sync resumes

Improvements

• CorePassed OTEL exporter settings into managed workspaces so telemetry works there too
• CoreNormalized provider metadata defaults so models still load when catalog data is incomplete
• CorePassed EXA_API_KEY to the websearch tool to reduce rate limits@rasdani
• TerminalAdded a restore flow for sessions whose workspace is unavailable, with clearer workspace status indicators
• TerminalFixed agent cycling when no agent is selected and improved prompt key handling