feat: initial commit for git-worktree plugin

README.md

@@ -0,0 +1,12 @@
+# @local/git-worktree
+
+Git worktree isolation for DeepSeek Harness (DSH).
+
+Provides agent tools for managing Git worktrees, enabling isolated execution environments for parallel tasks, subagents, and risk-free experimentation without colliding in the main repository working directory.
+
+## Tools Provided
+
+- `worktree_list`: List all active Git worktrees with branches and commit heads.
+- `worktree_create`: Create an isolated Git worktree on a new or existing branch inside `.worktrees/`.
+- `worktree_remove`: Remove an isolated worktree and optionally delete the branch.
+- `worktree_merge`: Merge or squash changes from an isolated worktree branch back into the target branch.