Operators already use the Active Agents tree as a runtime control surface, so the session row should reveal the live terminal before it offers lower-value diff navigation. This patch swaps the inline diff action for a terminal action, matches live terminals by session pid when possible, falls back to a worktree terminal when needed, and routes Stop through Ctrl+C before the CLI fallback.

Constraint: Active session metadata exposes pid and worktree path but no durable VS Code terminal id
Rejected: Keep Open Diff inline | lower operator value than terminal reveal for live task control
Confidence: high
Scope-risk: narrow
Directive: Keep session terminal matching pid-first unless the launcher gains a stable terminal identity field
Tested: node --test test/vscode-active-agents-session-state.test.js; openspec validate agent-codex-active-agents-terminal-controls-2026-04-23-17-11 --type change --strict; openspec validate --specs
Not-tested: Real VS Code terminal matching against existing interactive terminals outside the mock processId flow