chore: wire up the new garmin.Config shape, refresh start.sh and CLAUDE.md

Removes the last references to garmin.Config.ServerPath and the
MCP_GARMIN_* env vars now that the wrapper script is embedded in the
binary; updates CLAUDE.md's mcp-garmin section to describe the direct
wrapper instead.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

backend/cmd/geniusrund/main.go

@@ -44,7 +44,6 @@ func main() {
 
 	server := api.NewServer(db, garmin.NewClient, garmin.Config{
 		PythonPath:     cfg.GarminPythonPath,
-		ServerPath:     cfg.GarminServerPath,
 		TokenStorePath: cfg.GarminTokenStoreRoot,
 	}, appsync.Config{
 		MinConfidence: cfg.MinConfidence,

backend/internal/api/server.go

@@ -34,7 +34,7 @@ type Server struct {
 	// *mock.Client (see newTestServer in api_test.go).
 	GarminFactory func(garmin.Config) garmin.Client
 	// GarminBase holds the plumbing shared by every user's garmin.Config
-	// (subprocess paths + the token-store root directory); only
+	// (the python interpreter path + the token-store root directory); only
 	// GarminEmail/GarminPassword/TokenStorePath vary per user, filled in by
 	// garminFor.
 	GarminBase garmin.Config

backend/start.sh

@@ -2,8 +2,9 @@
 set -euo pipefail
 cd "$(dirname "$0")"
 
-export MCP_GARMIN_PYTHON="${MCP_GARMIN_PYTHON:-/Users/cvila/Dev/scm/scm.vilanet.fr/kriss/mcp-garmin/.venv/bin/python3}"
-export MCP_GARMIN_SERVER="${MCP_GARMIN_SERVER:-/Users/cvila/Dev/scm/scm.vilanet.fr/kriss/mcp-garmin/server.py}"
+# GARMIN_WRAPPER_PYTHON is optional (config.Load() defaults it to "python3"
+# on PATH). Export it yourself only if you want a specific interpreter, e.g.
+# a local venv with garminconnect installed.
 export GENIUSRUN_DB_PATH="${GENIUSRUN_DB_PATH:-geniusrun.db}"
 
 # OIDC login gate -- no safe default exists for a client secret or a