v0.2.0

• Start working in a worktree: Start working creates a worktree for the issue branch (from the freshly fetched default branch) and starts the agent there in a background tab, with an Open toast. The dialog closes at once; progress shows in a toast. "This checkout" keeps the old behaviour.
• Agent sessions start immediately: Start working, "Work on it in a new session", "Pre-review with agent" and CI job sessions are created and sent their prompt in a background tab instead of opening a draft.
• Worktree awareness: branch picker badges and "Open session there" for branches checked out elsewhere; "Remove worktree & delete branch" after a merge in a worktree session; clean-up skips worktree branches.
• Close with a reason: Close issue ▾ offers completed, not planned or duplicate (also in the issue ⋯ menu and list row menus), and posts the typed comment with it ("Close with comment" / "Reopen with comment").
• How an issue was closed: the state chip and list icons show Closed as completed / not planned / duplicate.
• No stale merged PRs: a branch shows a merged or closed pull request only while it still points at that PR's head, and the default branch never does, so long-lived branches like dev stop showing an old release PR.
• Fix: the agent starts even when the issue's context cannot be loaded.