Add compare and tui commands with shared sort/filter CLI wiring

- add pubcli compare command to rank nearby stores by filtered deal coverage, bogo count, aggregate score, and distance tie-breaks
- support --count (1-10) for comparison breadth and emit structured JSON/text output with ranked entries
- add robust distance token parsing to tolerate upstream distance string formatting differences
- add pubcli tui interactive terminal browser with paging, deal detail drill-in, and explicit TTY validation for stdin/stdout
- share deal-filter flag registration across root/tui/compare and add --sort support in root execution path
- validate sort mode early and allow canonical aliases (end, expiry, expiration) while preserving explicit invalid-arg guidance
- expand tolerant CLI normalization for new commands/flags and aliases (orderby, sortby, count, bare-flag rewrite for compare/tui)
- update quick-start flag list and integration tests to cover compare help and normalization behavior

cmd/root_integration_test.go

@@ -30,6 +30,17 @@ func TestRunCLI_HelpStores(t *testing.T) {
 	assert.Empty(t, stderr.String())
 }
 
+func TestRunCLI_HelpCompare(t *testing.T) {
+	var stdout bytes.Buffer
+	var stderr bytes.Buffer
+
+	code := runCLI([]string{"help", "compare"}, &stdout, &stderr)
+
+	assert.Equal(t, 0, code)
+	assert.Contains(t, stdout.String(), "pubcli compare [flags]")
+	assert.Empty(t, stderr.String())
+}
+
 func TestRunCLI_TolerantRewriteWithoutNetworkCall(t *testing.T) {
 	var stdout bytes.Buffer
 	var stderr bytes.Buffer