refactor(dashboard-agent): move the watch data layer into the Watch PR

The watch tables and the 0002 migration stay here, so the committed drizzle
snapshot keeps describing them. The four contract types the schema annotates
are widened here and re-narrowed where the watch code lands.

Author: kathiekiwi

apps/webapp/test/dashboardAgentCreateChatOrdering.test.ts

@@ -93,7 +93,7 @@ describe("dashboard agent chat creation — nothing fallible after the row exist
     mocks.mintUserActorToken.mockReset().mockResolvedValue("tr_uat_real");
     mocks.mintPublicToken.mockReset().mockResolvedValue("pat_public");
     mocks.startSession.mockReset().mockResolvedValue(undefined);
-    mocks.softDeleteChat.mockReset().mockResolvedValue({ deleted: true, cancelledWatches: [] });
+    mocks.softDeleteChat.mockReset().mockResolvedValue({ deleted: true });
     mocks.env.ANTHROPIC_API_KEY = "sk-test";
   });
 
@@ -144,7 +144,7 @@ describe("dashboard agent chat creation — a start that fails part way", () =>
     mocks.mintUserActorToken.mockReset().mockResolvedValue("tr_uat_real");
     mocks.mintPublicToken.mockReset().mockResolvedValue("pat_public");
     mocks.startSession.mockReset().mockResolvedValue(undefined);
-    mocks.softDeleteChat.mockReset().mockResolvedValue({ deleted: true, cancelledWatches: [] });
+    mocks.softDeleteChat.mockReset().mockResolvedValue({ deleted: true });
     mocks.env.ANTHROPIC_API_KEY = "sk-test";
     mocks.logger.error.mockReset();
   });

apps/webapp/test/dashboardAgentTranscriptStore.test.ts

@@ -677,9 +677,7 @@ describe("countUserMessages", () => {
 
       await persistMessages(agentDb, {
         chatId: "chat_a",
-        // A consent record is a user message but not a turn the user spent, so the
-        // quota's prefix filter must skip it.
-        messages: [userMessage("u1"), textMessage("a1"), userMessage("watch-request:req_1")],
+        messages: [userMessage("u1"), textMessage("a1")],
       });
       await persistMessages(agentDb, { chatId: "chat_b", messages: [userMessage("u2")] });
       await persistMessages(agentDb, { chatId: "chat_gone", messages: [userMessage("u3")] });

internal-packages/dashboard-agent-contracts/src/index.ts

@@ -9,4 +9,3 @@ export * from "./page-context.js";
 export * from "./run-filters.js";
 export * from "./suggested-prompts.js";
 export * from "./trigger-uri.js";
-export * from "./watch.js";