refactor(bridge): migrate gravity bridge to pure websocket gateway architecture, deleting legacy local file scanners and dependencies

models.py

@@ -0,0 +1,55 @@
+import time
+from dataclasses import dataclass, field
+from enum import Enum
+
+
+class ApprovalStatus(Enum):
+    PENDING = "pending"
+    APPROVED = "approved"
+    REJECTED = "rejected"
+    TIMEOUT = "timeout"
+
+
+@dataclass
+class ApprovalRequest:
+    """An approval request from Antigravity."""
+    request_id: str
+    conversation_id: str
+    command: str           # The command/action needing approval
+    description: str       # Human-readable description
+    timestamp: float
+    status: str = "pending"
+    discord_message_id: int = 0
+    project_name: str = ""  # Project routing key
+    step_type: str = ""  # e.g. 'diff_review', passed through to response
+    safe_to_auto_run: bool = False  # Allows bot to silently auto-approve
+
+
+@dataclass
+class UserResponse:
+    """A user response from Discord."""
+    request_id: str
+    approved: bool
+    user_input: str = ""
+    timestamp: float = field(default_factory=time.time)
+    button_index: int = -1  # -1 = legacy (approve/reject), 0+ = specific button index
+    step_type: str = ""  # pass through from pending for extension routing
+    project_name: str = ""  # for multi-project: extension uses this when pending file is missing
+
+
+class EventType(Enum):
+    """Types of brain events."""
+    SESSION_START = "session_start"      # New conversation directory created
+    FILE_CHANGED = "file_changed"        # Watched file modified
+    FILE_CREATED = "file_created"        # Watched file first created
+
+
+@dataclass
+class BrainEvent:
+    """An event from the brain directory."""
+    event_type: EventType
+    conversation_id: str
+    file_name: str = ""
+    file_path: str = None
+    content: str = ""
+    timestamp: float = field(default_factory=time.time)