chore(types): tighten any types and fix langchain getType deprecation (#2444)

* chore(types): tighten any types and fix langchain getType deprecation

- Replace `message.getType()` with `message.type` in BedrockChatModel
- Type `docToSave` as `OramaDocument` and `explanation` as `SearchExplanation`
- Extract a typed `fallbackMetadata` to avoid `any` union warnings

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

* fix(lint): drop unnecessary `as unknown` cast on upsert return

Now that `docToSave` is typed as `OramaDocument`, it's already assignable
to the `Promise<unknown>` return type without an explicit cast.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/LLMProviders/BedrockChatModel.ts

@@ -391,13 +391,14 @@ export class BedrockChatModel extends BaseChatModel<BedrockChatModelCallOptions>
       const fallback = await this._generate(messages, options, runManager);
       const fallbackText = fallback.generations[0]?.text ?? "";
       if (fallbackText) {
+        const fallbackMetadata: Record<string, unknown> = fallback.llmOutput ?? {};
         yield new ChatGenerationChunk({
           message: new AIMessageChunk({
             content: fallbackText,
-            response_metadata: fallback.llmOutput ?? {},
+            response_metadata: fallbackMetadata,
           }),
           text: fallbackText,
-          generationInfo: fallback.llmOutput ?? {},
+          generationInfo: fallbackMetadata,
         });
       }
     }
@@ -1251,7 +1252,7 @@ export class BedrockChatModel extends BaseChatModel<BedrockChatModelCallOptions>
     const systemPrompts: string[] = [];
 
     messages.forEach((message) => {
-      const messageType = message.getType();
+      const messageType = message.type;
 
       // Handle system messages (always text-only)
       if (messageType === "system") {

src/search/dbOperations.ts

@@ -368,7 +368,7 @@ export class DBOperations {
     };
   }
 
-  async upsert(docToSave: any): Promise<unknown> {
+  async upsert(docToSave: OramaDocument): Promise<unknown> {
     if (!this.oramaDb) throw new Error("DB not initialized");
     const db = this.oramaDb;
 
@@ -400,7 +400,7 @@ export class DBOperations {
           );
 
           this.markUnsavedChanges();
-          return docToSave as unknown;
+          return docToSave;
         } catch (insertErr) {
           logError(
             `Failed to ${existingDoc.hits.length > 0 ? "update" : "insert"} document ${docToSave.id}:`,

src/search/v3/utils/ScoreNormalizer.ts

@@ -1,4 +1,4 @@
-import { NoteIdRank } from "../interfaces";
+import { NoteIdRank, SearchExplanation } from "../interfaces";
 
 /**
  * Configuration for score normalization
@@ -29,7 +29,11 @@ export class ScoreNormalizer {
   /**
    * Update explanation with normalized scores
    */
-  private updateExplanation(explanation: any, originalScore: number, normalizedScore: number): any {
+  private updateExplanation(
+    explanation: SearchExplanation | undefined,
+    originalScore: number,
+    normalizedScore: number
+  ): SearchExplanation | undefined {
     if (!explanation) return undefined;
 
     return {