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/integration/api-run-events.spec.ts

@@ -33,7 +33,7 @@ async function createHarness() {
     repoRef: "",
     isPrimary: true,
   });
-  const agentId = db.saveAgent({
+  const agentId = db.agents.saveAgent({
     companyId,
     name: "Helios",
     role: "CEO",
@@ -46,7 +46,7 @@ async function createHarness() {
     capabilities: "Operate the company",
     budgetMonthlyUsd: 100,
   });
-  const taskId = db.saveTask({
+  const taskId = db.tasks.saveTask({
     companyId,
     title: "Ship the API",
     description: "Capture structured run events.",