feat(mcp): agents archive other threads and edit project actions

[pandec]

The fork CLI is being removed in favor of in-app MCP tools. Two CLI capabilities had no tool equivalent: archiving another thread (after its turn, optionally removing its worktree), and editing project actions. Upstream's t3_project_update writes legacy project-row scripts, which are not the actions the UI resolves from settings.

• archive_thread, archive_thread_status, cancel_thread_archive take an optional threadId. Omitted keeps today's self behavior; a target uses the standard access rules (status via readThread, schedule/cancel via readWritableThread).
• New fork tools t3_project_actions_list / _upsert / _remove backed by a ProjectActions service that writes through the existing settings compare-and-set: stable ids from names, omitted fields preserved, single run-on-worktree-create invariant, conflict error on concurrent edits. Edits need a full-access caller, like t3_project_update.

Part of the CLI-to-MCP move with the fork CLI removal and thread-tools PRs.

Claude Opus 5.5 via Claude Code (T3 Code)

[coderabbitai]

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Reviewing files that changed from the base of the PR and between e3d3ec8 and a8c1803.

📒 Files selected for processing (12)

• README.md
• apps/server/src/mcp/McpHttpServer.ts
• apps/server/src/mcp/toolkits/archive/handlers.test.ts
• apps/server/src/mcp/toolkits/archive/handlers.ts
• apps/server/src/mcp/toolkits/archive/tools.ts
• apps/server/src/mcp/toolkits/projectActions/handlers.test.ts
• apps/server/src/mcp/toolkits/projectActions/handlers.ts
• apps/server/src/mcp/toolkits/projectActions/tools.ts
• apps/server/src/mcp/toolkits/voice/registration.test.ts
• apps/server/src/project/ProjectActions.test.ts
• apps/server/src/project/ProjectActions.ts
• docs/user/thread-sidebar.md

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