feat(codecontext): upgrade sidecar to boocontext MCP aggregator

- Multi-stage Dockerfile builds boocontext (Node) + HTTP shim (Go)
- shim.go supports CODECONTEXT_CHILD env var for configurable MCP child
- Adds routes for get_symbol_details, get_call_graph, get_blast_radius
- docker-compose.yml adds env vars for child MCP paths

codecontext/shim.go

@@ -26,6 +26,7 @@ import (
 	"os"
 	"os/exec"
 	"os/signal"
+	"strings"
 	"sync"
 	"sync/atomic"
 	"syscall"
@@ -185,13 +186,14 @@ func notify(method string, params any) error {
 // ---- Child lifecycle ----
 
 func startChild() error {
-	// `codecontext mcp` with --watch=true (the default) keeps fsnotify
-	// running on the indexed directory; the per-call target_dir swap
-	// invalidates and re-indexes on demand. `--target=/opt/projects` is the
-	// initial scan target — codecontext rebuilds the graph against whatever
-	// target_dir each call carries, so this is just a valid bootstrap path
-	// (the default "." is the alpine root and trips on transient /proc fds).
-	child = exec.Command("codecontext", "mcp", "--target=/opt/projects", "--watch=true", "--respect-gitignore")
+	// Support CODECONTEXT_CHILD env var for overriding the MCP child command.
+	// Default to boocontext (Node.js MCP aggregator). Set in docker-compose.
+	childCmd := os.Getenv("CODECONTEXT_CHILD")
+	if childCmd == "" {
+		childCmd = "node /usr/local/lib/boocontext/dist/index.js"
+	}
+	parts := strings.Split(childCmd, " ")
+	child = exec.Command(parts[0], parts[1:]...)
 	var err error
 	childStdin, err = child.StdinPipe()
 	if err != nil {
@@ -417,6 +419,9 @@ func main() {
 	mux.HandleFunc("POST /v1/watch_changes", makeToolHandler("watch_changes"))
 	mux.HandleFunc("POST /v1/get_semantic_neighborhoods", makeToolHandler("get_semantic_neighborhoods"))
 	mux.HandleFunc("POST /v1/get_framework_analysis", makeToolHandler("get_framework_analysis"))
+	mux.HandleFunc("POST /v1/get_symbol_details", makeToolHandler("get_symbol_details"))
+	mux.HandleFunc("POST /v1/get_call_graph", makeToolHandler("get_call_graph"))
+	mux.HandleFunc("POST /v1/get_blast_radius", makeToolHandler("get_blast_radius"))
 
 	server := &http.Server{
 		Addr:              ":8080",