Codemod db pass-through calls: messages + runs + approvals + company (C1 part 2/3)

Rewrite ~376 call sites for messages, runs, approvalsMod, and company
domains and delete the corresponding pass-through methods on
AppDatabase / AppDatabaseBase. Structural type references
(ReturnType<HandlerDeps["db"]["getRun"]>) and SweepStaleReviewsDeps-style
mocks are updated to route through the owning sub-module.

src/main/task-quality-gates.ts

@@ -214,7 +214,7 @@ export function sweepStaleReviews(
     const chain = deps.db.agents.getChainOfCommand(reviewer.id);
     const escalationTarget = chain.length > 0 ? chain[0] : null;
 
-    const pendingApproval = deps.db.findPendingApprovalForTask(companyId, task.id);
+    const pendingApproval = deps.db.approvalsMod.findPendingApprovalForTask(companyId, task.id);
 
     // In ai_cofounder mode, ALL approvals require human decision — never auto-advance.
     if (isCofounderMode && pendingApproval) {