Add CLI input tolerance with fuzzy flag/command matching

Agent-friendly argument normalization that auto-corrects common
CLI syntax mistakes before cobra parses them:
- Single-dash long flags: -zip -> --zip
- Bare key=value: zip=33101 -> --zip=33101
- Typos via Levenshtein distance (max 2): --ziip -> --zip
- Command typos: categoriess -> categories
- Flag aliases: --zipcode, --dept, --search -> canonical names

Corrections emit a "note:" line to stderr showing what was rewritten.
Positional arguments for completion/help subcommands are preserved
(e.g., "completion zsh" is not rewritten). Integration tests verify
end-to-end behavior including tolerance notes, double-dash boundaries,
and help output for rewritten args.

cmd/root_integration_test.go

@@ -0,0 +1,53 @@
+package cmd
+
+import (
+	"bytes"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRunCLI_CompletionZsh(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	code := runCLI([]string{"completion", "zsh"}, &stdout, &stderr)
+
+	assert.Equal(t, 0, code)
+	assert.Contains(t, stdout.String(), "#compdef pubcli")
+	assert.Empty(t, stderr.String())
+}
+
+func TestRunCLI_HelpStores(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	code := runCLI([]string{"help", "stores"}, &stdout, &stderr)
+
+	assert.Equal(t, 0, code)
+	assert.Contains(t, stdout.String(), "pubcli stores [flags]")
+	assert.Empty(t, stderr.String())
+}
+
+func TestRunCLI_TolerantRewriteWithoutNetworkCall(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	code := runCLI([]string{"stores", "-zip", "33101", "--help"}, &stdout, &stderr)
+
+	assert.Equal(t, 0, code)
+	assert.Contains(t, stdout.String(), "pubcli stores [flags]")
+	assert.Contains(t, stderr.String(), "interpreted `-zip` as `--zip`")
+}
+
+func TestRunCLI_DoubleDashBoundary(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	code := runCLI([]string{"stores", "--", "zip", "33101", "--help"}, &stdout, &stderr)
+
+	assert.Equal(t, 0, code)
+	assert.Contains(t, stdout.String(), "pubcli stores [flags]")
+	assert.False(t, strings.Contains(stderr.String(), "interpreted `zip` as `--zip`"))
+}