feat(ai): migrate gemini-cli references to antigravity-cli (agy)

Rename gemini-resume → antigravity-resume and save_gemini_session →
save_antigravity_session; update all session files from .gemini_session
to .antigravity_session and LAST_GEMINI_SESSION → LAST_ANTIGRAVITY_SESSION.
Replace gemini/gemini-cli binary calls with agy throughout superpowers,
code-resume, and the resume function. Add antigravity-ide wrapper for the
renamed IDE binary; update abbr v → antigravity-ide (VSCode-equivalent)
and update README/requirements to reflect the new tool names.

functions/antigravity-ide.fish

@@ -0,0 +1,8 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# alias antigravity-ide=antigravity
+function antigravity-ide --wraps='antigravity-ide' --description 'alias antigravity-ide=antigravity-ide'
+    # In fish, we pipe stderr using '2>|' to another command
+    command antigravity-ide $argv 2>| grep -v "'app' is not in the list of known options" >&2
+end

functions/antigravity-resume.fish

@@ -0,0 +1,23 @@
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# Execute antigravity-resume
+function antigravity-resume --description 'Execute antigravity-resume'
+    if not type -q agy
+        echo "Error: The 'agy' command is not installed or not in PATH." >&2
+        return 1
+    end
+    if not type -q save_antigravity_session
+        echo "Error: The companion function 'save_antigravity_session' is missing." >&2
+        return 1
+    end
+
+    if test -f .antigravity_session
+        set -l sid (cat .antigravity_session)
+        # Use --resume (or -r) to jump back in
+        agy --resume $sid
+    else
+        # Fallback to the interactive session browser
+        agy --resume
+    end
+end

functions/antigravity.fish

@@ -1,8 +1,8 @@
 # Copyright (C) 2026 Rootiest
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-# alias antigravity=antigravity
-function antigravity --wraps='antigravity' --description 'alias antigravity=antigravity'
+# alias antigravity=agy
+function antigravity --wraps='agy' --description 'alias antigravity=agy'
     # In fish, we pipe stderr using '2>|' to another command
-    command antigravity $argv 2>| grep -v "'app' is not in the list of known options" >&2
+    command agy $argv 2>| grep -v "'app' is not in the list of known options" >&2
 end

functions/code-resume.fish

@@ -7,10 +7,10 @@ function code-resume --description 'Execute code-resume'
         set -l sid (cat .claude_session)
         echo "Resuming Claude session: $sid"
         claude --resume $sid
-    else if test -f .gemini_session
-        set -l sid (cat .gemini_session)
-        echo "Resuming Gemini session: $sid"
-        gemini --resume $sid
+    else if test -f .antigravity_session
+        set -l sid (cat .antigravity_session)
+        echo "Resuming antigravity-cli session: $sid"
+        agy --resume $sid
     else
         echo "No local AI session found. Opening picker..."
         claude --resume # Default to Claude picker

functions/save_antigravity_session.fish

@@ -0,0 +1,32 @@
+#!/usr/bin/env fish
+
+# Copyright (C) 2026 Rootiest
+# SPDX-License-Identifier: AGPL-3.0-or-later
+
+# 1. Read the JSON from stdin
+set -l input (cat)
+
+# 2. Extract session_id using Python
+set -l sid (echo $input | python3 -c "import sys,json; print(json.load(sys.stdin).get('session_id', ''))")
+set -l session_file ".antigravity_session"
+
+if test -n "$sid"
+    # 3. Save the session ID locally
+    echo "$sid" >$session_file
+
+    # 4. Smart .gitignore check
+    # We only attempt this if we are inside a Git repository
+    if git rev-parse --is-inside-work-tree >/dev/null 2>&1
+        # If 'git check-ignore' fails, it means the file is NOT currently ignored
+        if not git check-ignore -q $session_file
+            # Append a labeled entry to .gitignore
+            echo -e "\n# AI Session IDs\n$session_file" >>.gitignore
+        end
+    end
+
+    # 5. Update universal variable for cross-terminal access
+    set -U LAST_ANTIGRAVITY_SESSION "$sid"
+end
+
+# MANDATORY: Every hook must output valid JSON or an empty object
+echo '{}'

functions/superpowers.fish

@@ -1,17 +1,17 @@
 # Copyright (C) 2026 Rootiest
 # SPDX-License-Identifier: AGPL-3.0-or-later
 
-# Toggle superpowers extension for Gemini and Claude
-function superpowers --description 'Toggle superpowers extension for Gemini and Claude'
-    set -l scope_gemini workspace
+# Toggle superpowers extension for antigravity-cli and Claude
+function superpowers --description 'Toggle superpowers extension for antigravity-cli and Claude'
+    set -l scope_agy workspace
     set -l scope_claude project
     set -l mode ""
     set -l help_text "
 Usage: superpowers [on|off] [options]
 
 Commands:
-  on       Enable superpowers for Gemini and Claude
-  off      Disable superpowers for Gemini and Claude
+  on       Enable superpowers for antigravity-cli and Claude
+  off      Disable superpowers for antigravity-cli and Claude
 
 Options:
   -g, --global    Apply settings to the user/global scope
@@ -26,7 +26,7 @@ Options:
             case off
                 set mode disable
             case -g --global
-                set scope_gemini user
+                set scope_agy user
                 set scope_claude user
             case -h --help
                 echo $help_text
@@ -40,10 +40,10 @@ Options:
         return 1
     end
 
-    echo "Setting superpowers to: $mode (Scope: Gemini=$scope_gemini, Claude=$scope_claude)..."
+    echo "Setting superpowers to: $mode (Scope: antigravity-cli=$scope_agy, Claude=$scope_claude)..."
 
-    # Execute Gemini command
-    gemini extensions $mode superpowers --scope $scope_gemini
+    # Execute antigravity-cli command
+    agy extensions $mode superpowers --scope $scope_agy
 
     # Execute Claude command
     claude plugins $mode superpowers --scope $scope_claude