Accept story 33: Copy-paste diff commands for agent worktrees

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

.story_kit/stories/current/33_worktree_diff_integration.md

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-name: Copy-Paste Diff Commands for Agent Worktrees
-test_plan: pending
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-# Story 33: Copy-Paste Diff Commands for Agent Worktrees
-
-## User Story
-**As a** supervisor coordinating agents across worktrees,
-**I want** each agent's worktree to be reviewable with a single copy-paste command using my preferred diff tool,
-**So that** I can quickly inspect in-progress work without leaving my terminal workflow.
-
-## Context
-Agents work in separate git worktrees. The supervisor needs to review what an agent has changed at any point — not through a bespoke in-browser diff viewer, but using the tools they already use (e.g., `git cola`, `meld`, `kdiff3`, or whatever the user has configured as their `git diff.tool`). The simplest version of this is a ready-to-run shell command the user can copy and paste.
-
-## Acceptance Criteria
-- [ ] The UI shows a copy-paste command for each active agent worktree that opens the diff using `git difftool` (which delegates to the user's configured `diff.tool`).
-- [ ] The command works from any directory (uses absolute paths or `cd` into the worktree).
-- [ ] The diff is against the base branch (e.g., `git difftool master...HEAD`) so the user sees only the agent's changes, not unrelated history.
-- [ ] Clicking the command copies it to the clipboard.
-
-## Out of Scope
-- Building a diff viewer in the frontend.
-- Full code review workflow (comments, approvals).
-- Automatic merge or conflict resolution.