fix: address Phase 0 review — rename CustomSSEEvent, add Bedrock context windows, debug guards

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: ryaneggz <kre8mymedia@gmail.com>

Author: ryaneggz

backend/src/constants/__init__.py

@@ -135,3 +135,6 @@ def values(cls) -> list[str]:
 # Thread Search
 # Number of recent messages to store per thread snapshot for semantic search
 THREAD_SNAPSHOT_MESSAGE_COUNT = 20
+
+# Phase enum
+from src.constants.phases import AgentPhase  # noqa: E402, F401

backend/src/constants/llm.py

@@ -233,11 +233,25 @@ def _safe_int_env(var_name: str, default: int) -> int:
     # Groq
     "groq:openai/gpt-oss-120b": 128_000,
     "groq:llama-3.3-70b-versatile": 128_000,
+    # Bedrock
+    "bedrock_converse:us.anthropic.claude-sonnet-4-5-20250929-v1:0": 200_000,
+    "bedrock_converse:us.anthropic.claude-haiku-4-5-20251001-v1:0": 200_000,
+    "bedrock_converse:us.anthropic.claude-opus-4-5-20251101-v1:0": 200_000,
+    "bedrock_converse:us.moonshot.kimi-k2-thinking": 131_072,
+    "bedrock_converse:us.anthropic.claude-3-5-sonnet-20241022-v2:0": 200_000,
+    "bedrock_converse:us.anthropic.claude-3-5-haiku-20241022-v1:0": 200_000,
+    "bedrock_converse:amazon.titan-text-premier-v1:0": 32_768,
+    "bedrock_converse:us.meta.llama3-2-90b-instruct-v1:0": 128_000,
+    "bedrock_converse:us.mistral.mistral-large-2407-v1:0": 128_000,
 }
 
 DEFAULT_CONTEXT_WINDOW = 200_000  # Fallback for unknown models
 
 
 def get_context_window(model: str) -> int:
     """Get context window size for a model, with fallback."""
-    return MODEL_CONTEXT_WINDOWS.get(model, DEFAULT_CONTEXT_WINDOW)
+    size = MODEL_CONTEXT_WINDOWS.get(model)
+    if size is None:
+        logger.debug(f"context_window_fallback model={model} using default={DEFAULT_CONTEXT_WINDOW}")
+        return DEFAULT_CONTEXT_WINDOW
+    return size

frontend/src/hooks/useChat.ts

@@ -727,9 +727,11 @@ export default function useChat(): ChatContextType {
 		}
 
 		if (streamMode === "custom") {
-			// Custom events dispatched by feature-specific handlers
+			// Custom events dispatched by Phase 1+ feature handlers
 			// Sub-types: cost_update, plan_status, eval_progress, context_reset, span
-			console.debug("[custom event]", payload[1]);
+			if (import.meta.env.DEV) {
+				console.debug("[custom event]", payload[1]);
+			}
 			return;
 		}
 

frontend/src/lib/entities/stream.ts

@@ -64,7 +64,7 @@ export interface AbortedEvent {
 	data: { reason: string };
 }
 
-export interface CustomEvent {
+export interface CustomSSEEvent {
 	type: "custom";
 	data: {
 		type: string; // Sub-type: "cost_update", "plan_status", "eval_progress", etc.
@@ -86,7 +86,7 @@ export type SSEEvent =
 	| ValuesEvent
 	| ErrorEvent
 	| AbortedEvent
-	| CustomEvent;
+	| CustomSSEEvent;
 
 export interface DoneSignal {
 	type: "done";