feat: add ngit checkout command for non-interactive proposal checkout

Adds a new 'ngit checkout <event-id|nevent>' command that creates or
updates a proposal branch and checks it out. Supports both PRs and
patches with parent-commit references.

Phase 1 of non-interactive ngit list implementation.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/bin/ngit/cli.rs b/src/bin/ngit/cli.rs
index 47f4b27..5c1a097 100644
--- a/src/bin/ngit/cli.rs
+++ b/src/bin/ngit/cli.rs
@@ -106,6 +106,11 @@ pub enum Commands {
     Send(sub_commands::send::SubCommandArgs),
     /// list PRs; checkout, apply or download selected
     List,
+    /// checkout a proposal branch by event-id or nevent
+    Checkout {
+        /// Proposal event-id (hex) or nevent (bech32)
+        id: String,
+    },
     /// update repo git servers to reflect nostr state (add, update or delete
     /// remote refs)
     Sync(sub_commands::sync::SubCommandArgs),