Add safe coding-agent integration removal

.surface

@@ -13159,6 +13159,7 @@ FLAG basecamp setup agents --no-stats type=bool
 FLAG basecamp setup agents --profile type=string
 FLAG basecamp setup agents --project type=string
 FLAG basecamp setup agents --quiet type=bool
+FLAG basecamp setup agents --remove type=bool
 FLAG basecamp setup agents --stats type=bool
 FLAG basecamp setup agents --styled type=bool
 FLAG basecamp setup agents --todolist type=string

README.md

@@ -280,6 +280,19 @@ To pick up a newer plugin version later, refresh the marketplace with
 
 **Other agents:** Point your agent at [`skills/basecamp/SKILL.md`](skills/basecamp/SKILL.md) for Basecamp workflow coverage.
 
+To remove the Basecamp-managed shared skill and coding-agent plugins without
+removing Basecamp authentication, configuration, or data, run:
+
+```bash
+basecamp setup agents --remove
+```
+
+The command leaves user-authored skill directories and additional files alone.
+It also keeps the `37signals` marketplace registration in Claude, which may serve
+other plugins; remove it yourself with `claude plugin marketplace remove 37signals`.
+The command uses the `codex` binary to inspect and remove the Codex plugin, so
+that binary must still be installed.
+
 **Agent discovery:** Every command supports `--help --agent` for structured JSON output (flags, gotchas, subcommands). Use `basecamp commands --json` for the full catalog.
 
 See [install.md](install.md) for step-by-step setup instructions.

internal/appctx/context.go

@@ -3,6 +3,7 @@ package appctx
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/http"
 	"os"
@@ -276,6 +277,10 @@ func (a *App) OK(data any, opts ...output.ResponseOption) error {
 func (a *App) Err(err error) error {
 	// Determine if we should include stats
 	var opts []output.ErrorResponseOption
+	var carrier output.ErrorMetaProvider
+	if errors.As(err, &carrier) {
+		opts = append(opts, output.WithErrorMeta(carrier.ErrorMetadata()))
+	}
 	if a.shouldIncludeStatsInError() {
 		stats := a.Collector.Summary()
 		opts = append(opts, output.WithErrorStats(&stats))