feat(mcp): thread groups, drain status, and cross-project thread list for agents

[pandec]

The fork CLI is being removed in favor of in-app MCP tools. Three things it offered had no tool equivalent: thread groups (a fork feature), checking whether a thread is fully quiet before a session handover, and finding threads bound to a worktree across all projects (the worktree-cleanup claim check).

• New fork tool t3_thread_groups: list (sidebar order, Active included, unarchived counts), create (exact-name match returns the existing group), move_thread (into a group or back to Active; standard cross-thread access rules). Uses the same settings revision and ordering semantics as the web client.
• New fork tool t3_thread_drain_status (read-only): active run, queued runs, and background work via getBackgroundWorkDrain, with a single quiet flag.
• t3_thread_list gains allProjects and an exact worktreePath filter, and rows include projectId and worktreePath. Additive; defaults unchanged.

Part of the CLI-to-MCP move with #228 and #229.

Claude Opus 5.5 via Claude Code (T3 Code)

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📥 Commits

Reviewing files that changed from the base of the PR and between 2bcaab6 and 6a060b0.

📒 Files selected for processing (16)

• README.md
• apps/server/src/mcp/McpHttpServer.ts
• apps/server/src/mcp/OrchestratorMcpService.threadList.test.ts
• apps/server/src/mcp/OrchestratorMcpService.ts
• apps/server/src/mcp/ThreadGroupsMcpService.ts
• apps/server/src/mcp/toolkits/orchestrator/tools.ts
• apps/server/src/mcp/toolkits/threadDrain/handlers.test.ts
• apps/server/src/mcp/toolkits/threadDrain/handlers.ts
• apps/server/src/mcp/toolkits/threadDrain/tools.ts
• apps/server/src/mcp/toolkits/threadGroups/handlers.test.ts
• apps/server/src/mcp/toolkits/threadGroups/handlers.ts
• apps/server/src/mcp/toolkits/threadGroups/registration.test.ts
• apps/server/src/mcp/toolkits/threadGroups/tools.ts
• apps/server/src/orchestration-v2/ThreadManagementService.ts
• docs/orchestration-v2/orchestrator-mcp-server.md
• packages/contracts/src/orchestratorMcp.ts

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