codeintel: fix codebase_overview to accept string or int for offset/limit

LLMs sometimes send integer parameters as strings (e.g. "20" instead of 20).
Add flexInt type that unmarshals from either JSON int or string.

tools/codeintel/main.go

@@ -8,6 +8,7 @@ import (
 	"fmt"
 	"os"
 	"path/filepath"
+	"strconv"
 	"strings"
 
 	"ollie/tools/codeintel/internal/codeintel"
@@ -36,6 +37,27 @@ func main() {
 
 func fail(e error) { fmt.Fprintln(os.Stderr, "error:", e); os.Exit(1) }
 
+// flexInt unmarshals from JSON int or string.
+type flexInt int
+
+func (f *flexInt) UnmarshalJSON(data []byte) error {
+	var i int
+	if err := json.Unmarshal(data, &i); err == nil {
+		*f = flexInt(i)
+		return nil
+	}
+	var s string
+	if err := json.Unmarshal(data, &s); err != nil {
+		return err
+	}
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		return err
+	}
+	*f = flexInt(n)
+	return nil
+}
+
 // --- code_outline ---
 
 func cmdOutline() {
@@ -164,9 +186,9 @@ func cmdDependencies() {
 
 func cmdOverview() {
 	var a struct {
-		Path   string `json:"path"`
-		Offset int    `json:"offset"`
-		Limit  int    `json:"limit"`
+		Path   string  `json:"path"`
+		Offset flexInt `json:"offset"`
+		Limit  flexInt `json:"limit"`
 	}
 	if err := json.NewDecoder(os.Stdin).Decode(&a); err != nil {
 		fail(err)
@@ -179,19 +201,20 @@ func cmdOverview() {
 	if err != nil {
 		fail(err)
 	}
-	start := a.Offset
+	start := int(a.Offset)
+	limit := int(a.Limit)
 	if start < 0 {
 		fail(fmt.Errorf("offset must be non-negative"))
 	}
-	if a.Limit < 0 {
+	if limit < 0 {
 		fail(fmt.Errorf("limit must be non-negative"))
 	}
 	if start >= len(files) {
 		start = len(files)
 	}
 	end := len(files)
-	if a.Limit > 0 && start+a.Limit < end {
-		end = start + a.Limit
+	if limit > 0 && start+limit < end {
+		end = start + limit
 	}
 	fmt.Printf("# Codebase Overview\n\nPath: `%s`\n\n", root)
 	if len(files) > 0 && (start > 0 || end < len(files)) {