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/message-dispatch.test.ts

@@ -41,7 +41,7 @@ function createScaffold(db: AppDatabase) {
     repoRef: "",
     isPrimary: true,
   });
-  const ceoId = db.saveAgent({
+  const ceoId = db.agents.saveAgent({
     companyId,
     name: "CEO",
     role: "CEO",
@@ -54,7 +54,7 @@ function createScaffold(db: AppDatabase) {
     capabilities: "Lead the company",
     budgetMonthlyUsd: 250,
   });
-  const ctoId = db.saveAgent({
+  const ctoId = db.agents.saveAgent({
     companyId,
     name: "CTO",
     role: "CTO",
@@ -68,7 +68,7 @@ function createScaffold(db: AppDatabase) {
     budgetMonthlyUsd: 200,
     department: "engineering",
   });
-  const cmoId = db.saveAgent({
+  const cmoId = db.agents.saveAgent({
     companyId,
     name: "CMO",
     role: "CMO",
@@ -82,7 +82,7 @@ function createScaffold(db: AppDatabase) {
     budgetMonthlyUsd: 200,
     department: "marketing",
   });
-  const pendingId = db.saveAgent({
+  const pendingId = db.agents.saveAgent({
     companyId,
     name: "Pending Recruit",
     role: "IC",
@@ -96,7 +96,7 @@ function createScaffold(db: AppDatabase) {
     budgetMonthlyUsd: 100,
     department: "engineering",
   });
-  const terminatedId = db.saveAgent({
+  const terminatedId = db.agents.saveAgent({
     companyId,
     name: "Former COO",
     role: "COO",
@@ -111,7 +111,7 @@ function createScaffold(db: AppDatabase) {
     department: "operations",
   });
 
-  const taskId = db.saveTask({
+  const taskId = db.tasks.saveTask({
     companyId,
     title: "Review architecture plan",
     description: "Need board feedback in the thread.",