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## Why Several legacy `EventMsg` variants were still emitted or mapped even though clients either ignored them or had moved to item/lifecycle events. `Op::Undo` had also degraded to an unavailable shim, so this removes that dead task path instead of preserving a command that cannot do useful work. `McpStartupComplete`, `WebSearchBegin`, and `ImageGenerationBegin` are intentionally kept because useful consumers still depend on them: MCP startup completion drives readiness behavior, and the begin events let app-server/core consumers surface in-progress web-search and image-generation items before the final payload arrives. ## What Changed - Removed weak legacy event variants and payloads from `codex-protocol`, including legacy agent deltas, background events, and undo lifecycle events. - Kept/restored `EventMsg::McpStartupComplete`, `EventMsg::WebSearchBegin`, and `EventMsg::ImageGenerationBegin` with serializer and emission coverage. - Updated core, rollout, MCP server, app-server thread history, review/delegate filtering, and tests to rely on the useful replacement events that remain. - Removed `Op::Undo`, `UndoTask`, the undo test module, and stale TUI slash-command comments. - Stopped agent job/background progress and compaction retry notices from emitting `BackgroundEvent` payloads. ## Verification - `cargo check -p codex-protocol -p codex-app-server-protocol -p codex-core -p codex-rollout -p codex-rollout-trace -p codex-mcp-server` - `cargo test -p codex-protocol -p codex-app-server-protocol -p codex-rollout -p codex-rollout-trace -p codex-mcp-server` - `cargo test -p codex-core --test all suite::items` - `just fix -p codex-protocol -p codex-app-server-protocol -p codex-core -p codex-rollout -p codex-rollout-trace -p codex-mcp-server` - Earlier coverage on this PR also included `codex-mcp`, `codex-tui`, core library tests, MCP/plugin/delegate/review/agent job tests, and MCP startup TUI tests.