fix: resolve two bugs found during live testing

- Add garc_core.py (underscore) alongside garc-core.py (hyphen);
  Python cannot import a hyphenated filename as a module, causing
  ModuleNotFoundError on every garc command
- Replace invalid scope people.readonly with directory.readonly
  in garc-core.py and scope-map.json; people.readonly does not
  exist in Google OAuth, causing error 400 invalid_scope on login

Verified working: garc gmail profile, garc calendar today,
garc gmail inbox, garc auth suggest

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

config/scope-map.json

@@ -222,7 +222,7 @@
     "read_contacts": {
       "scopes": [
         "https://www.googleapis.com/auth/contacts.readonly",
-        "https://www.googleapis.com/auth/people.readonly"
+        "https://www.googleapis.com/auth/directory.readonly"
       ],
       "identity": "user_access_token",
       "gate": "none",
@@ -238,7 +238,7 @@
     },
     "search_people": {
       "scopes": [
-        "https://www.googleapis.com/auth/people.readonly"
+        "https://www.googleapis.com/auth/directory.readonly"
       ],
       "identity": "user_access_token",
       "gate": "none",
@@ -364,7 +364,7 @@
         "https://www.googleapis.com/auth/calendar.readonly",
         "https://www.googleapis.com/auth/tasks.readonly",
         "https://www.googleapis.com/auth/contacts.readonly",
-        "https://www.googleapis.com/auth/people.readonly"
+        "https://www.googleapis.com/auth/directory.readonly"
       ],
       "description": "Read-only access to all GWS resources"
     },
@@ -379,7 +379,7 @@
         "https://www.googleapis.com/auth/calendar",
         "https://www.googleapis.com/auth/tasks",
         "https://www.googleapis.com/auth/contacts.readonly",
-        "https://www.googleapis.com/auth/people.readonly"
+        "https://www.googleapis.com/auth/directory.readonly"
       ],
       "description": "Write access to owned resources and send email"
     },
@@ -409,7 +409,7 @@
         "https://www.googleapis.com/auth/calendar",
         "https://www.googleapis.com/auth/tasks",
         "https://www.googleapis.com/auth/contacts.readonly",
-        "https://www.googleapis.com/auth/people.readonly",
+        "https://www.googleapis.com/auth/directory.readonly",
         "https://www.googleapis.com/auth/chat.messages"
       ],
       "description": "Back-office automation profile for office-work agents"