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Added split provider persistence under ~/.open-cowork/ai-provider/, with atomic per-provider JSON writes, automatic migration from the legacy config.json entry, and native-worker sync coverage.
Added versioned built-in provider presets and a "Restore defaults" action that refreshes built-in model definitions while preserving credentials, enabled states, and custom providers.
Changed
Reduced main-process startup work by deferring terminal, SSH, image/GIF, migration, channel-provider, updater, MCP, and database initialization until needed or after the first window begins loading.
Split renderer window surfaces and lazy-loaded secondary pages, update release-note rendering, Mermaid support, tokenizer data, and per-language locale bundles to improve first-paint time and reduce memory use.
Delayed the first Native Worker spawn until shell-environment initialization completes and moved high-volume startup diagnostics to deferred file writes.
Extracted SSH connection and proxy-jump payload resolution from the full SSH IPC handler so Git, cron, and sidecar consumers can load it independently.
Fixed
Prevented a rejected second app instance from accessing Electron session APIs or starting the Native Worker before app readiness, eliminating Session can only be received when app is ready during shutdown.
Temporarily stopped sending the unsupported "mode":"pro" parameter for GPT-5.6 Sol/Terra ultra requests while retaining their medium-effort fallback.