V3 Code v0.0.25 orchestrator audit update

Summary

• Adds the new orchestrator system foundation, including contracts, agent harness package, server orchestration lifecycle/events, chat provider selection, in-chat orchestrated session lanes, and Settings > Orchestrator.
• Includes audit fixes for orchestrated runtime correctness and performance: deterministic lane/task activities, provider-change restarts, lane chunk coalescing, task failure cleanup, atomic settings persistence, and safer migrations.
• Ships the Windows x64 installer for the orchestrator audit branch.

Assets

• V3-Code-0.0.25-v3.20260511.orchestrator-audit-x64.exe
• V3-Code-0.0.25-v3.20260511.orchestrator-audit-x64.exe.blockmap
• latest.yml

Validation

• bun fmt
• bun lint
• TURBO_DAEMON=false bun typecheck
• focused server tests
• apps/web production build
• Windows x64 desktop artifact build

Note: this is an unsigned local Windows build, consistent with the current local release artifact flow.