[codex] Add marketplace remove command and shared logic (#17752)

## Summary

Move the marketplace remove implementation into shared core logic so
both the CLI command and follow-up app-server RPC can reuse the same
behavior.

This change:
- adds a shared `codex_core::plugins::remove_marketplace(...)` flow
- moves validation, config removal, and installed-root deletion out of
the CLI
- keeps the CLI as a thin wrapper over the shared implementation
- adds focused core coverage for the shared remove path

## Validation

- `just fmt`
- focused local coverage for the shared remove path
- heavier follow-up validation deferred to stacked PR CI

codex-rs/cli/src/main.rs

@@ -1729,6 +1729,15 @@ mod tests {
         assert!(matches!(cli.subcommand, Some(Subcommand::Plugin(_))));
     }
 
+    #[test]
+    fn plugin_marketplace_remove_parses_under_plugin() {
+        let cli =
+            MultitoolCli::try_parse_from(["codex", "plugin", "marketplace", "remove", "debug"])
+                .expect("parse");
+
+        assert!(matches!(cli.subcommand, Some(Subcommand::Plugin(_))));
+    }
+
     #[test]
     fn marketplace_no_longer_parses_at_top_level() {
         let add_result =
@@ -1738,6 +1747,10 @@ mod tests {
         let upgrade_result =
             MultitoolCli::try_parse_from(["codex", "marketplace", "upgrade", "debug"]);
         assert!(upgrade_result.is_err());
+
+        let remove_result =
+            MultitoolCli::try_parse_from(["codex", "marketplace", "remove", "debug"]);
+        assert!(remove_result.is_err());
     }
 
     fn sample_exit_info(conversation_id: Option<&str>, thread_name: Option<&str>) -> AppExitInfo {

codex-rs/cli/src/marketplace_cmd.rs

@@ -5,9 +5,11 @@ use clap::Parser;
 use codex_core::config::Config;
 use codex_core::config::find_codex_home;
 use codex_core::plugins::MarketplaceAddRequest;
+use codex_core::plugins::MarketplaceRemoveRequest;
 use codex_core::plugins::PluginMarketplaceUpgradeOutcome;
 use codex_core::plugins::PluginsManager;
 use codex_core::plugins::add_marketplace;
+use codex_core::plugins::remove_marketplace;
 use codex_utils_cli::CliConfigOverrides;
 
 #[derive(Debug, Parser)]
@@ -23,6 +25,7 @@ pub struct MarketplaceCli {
 enum MarketplaceSubcommand {
     Add(AddMarketplaceArgs),
     Upgrade(UpgradeMarketplaceArgs),
+    Remove(RemoveMarketplaceArgs),
 }
 
 #[derive(Debug, Parser)]
@@ -47,6 +50,12 @@ struct UpgradeMarketplaceArgs {
     marketplace_name: Option<String>,
 }
 
+#[derive(Debug, Parser)]
+struct RemoveMarketplaceArgs {
+    /// Configured marketplace name to remove.
+    marketplace_name: String,
+}
+
 impl MarketplaceCli {
     pub async fn run(self) -> Result<()> {
         let MarketplaceCli {
@@ -61,6 +70,7 @@ impl MarketplaceCli {
         match subcommand {
             MarketplaceSubcommand::Add(args) => run_add(args).await?,
             MarketplaceSubcommand::Upgrade(args) => run_upgrade(overrides, args).await?,
+            MarketplaceSubcommand::Remove(args) => run_remove(args).await?,
         }
 
         Ok(())
@@ -120,6 +130,26 @@ async fn run_upgrade(
     print_upgrade_outcome(&outcome, marketplace_name.as_deref())
 }
 
+async fn run_remove(args: RemoveMarketplaceArgs) -> Result<()> {
+    let RemoveMarketplaceArgs { marketplace_name } = args;
+    let codex_home = find_codex_home().context("failed to resolve CODEX_HOME")?;
+    let outcome = remove_marketplace(
+        codex_home.to_path_buf(),
+        MarketplaceRemoveRequest { marketplace_name },
+    )
+    .await?;
+
+    println!("Removed marketplace `{}`.", outcome.marketplace_name);
+    if let Some(installed_root) = outcome.removed_installed_root {
+        println!(
+            "Removed installed marketplace root: {}",
+            installed_root.as_path().display()
+        );
+    }
+
+    Ok(())
+}
+
 fn print_upgrade_outcome(
     outcome: &PluginMarketplaceUpgradeOutcome,
     marketplace_name: Option<&str>,
@@ -201,4 +231,10 @@ mod tests {
         let upgrade_one = UpgradeMarketplaceArgs::try_parse_from(["upgrade", "debug"]).unwrap();
         assert_eq!(upgrade_one.marketplace_name.as_deref(), Some("debug"));
     }
+
+    #[test]
+    fn remove_subcommand_parses_marketplace_name() {
+        let remove = RemoveMarketplaceArgs::try_parse_from(["remove", "debug"]).unwrap();
+        assert_eq!(remove.marketplace_name, "debug");
+    }
 }