Codemod db pass-through calls to domain modules: tasks + agents (C1 part 1/3)

Rewrite ~525 call sites from `db.<method>()` to `db.<module>.<method>()`
for tasks and agents domains (including `getAgent`/`findAgent`/`getTask`
which live on the `entityCrud` field). Delete the corresponding
pass-through methods on AppDatabaseBase. Structural types that narrowed
`db` to a bag of flat methods (CapabilityMatchDb, EscalationDeps,
SweepStaleReviewsDeps) are reshaped to match the new namespace. Internal
callback references inside database.ts/database-base.ts now invoke the
owning module directly (e.g. `this.agents.saveAgent`) rather than the
deleted pass-through.

The codemod lives at scripts/codemod/remove-appdatabase-passthrough.mjs
and filters by owning module + optional explicit method list. It is
idempotent and does not re-rewrite already-namespaced calls.

tests/unit/tasks-phase.test.ts

@@ -55,7 +55,7 @@ function createTestWorkspace(db: AppDatabase, companyId: string): string {
 }
 
 function createTestAgent(db: AppDatabase, companyId: string, workspaceId: string, name = "Agent"): string {
-  return db.saveAgent({
+  return db.agents.saveAgent({
     companyId,
     name,
     role: "IC",
@@ -76,7 +76,7 @@ function createTestTask(
   agentId: string,
   workspaceId: string,
 ): string {
-  return db.saveTask({
+  return db.tasks.saveTask({
     companyId,
     title: "Phase helper task",
     description: "dual-write seed",