refactor(model-pool): scope disabled-models by company; cascade on delete (v42)

The per-connector "enabled/disabled model" settings lived under a
global key in the settings key-value table
(`disabled_models:${connectorId}`). No company dimension. Deleting a
company left the pool choices behind, and creating a new company
silently inherited them — the visible symptom was "onboarding's team-
model configuration survives company deletion and pollutes the next
company's CEO model list."

Root fix, not a cleanup hook: the storage becomes a real relational
table with `(company_id, connector_id)` primary key and an
`ON DELETE CASCADE` FK from `companies`. Company deletion wipes pool
config by construction; no cleanup step in `deleteCompany()` can
drift.

Schema (migration v42):
- CREATE TABLE connector_model_pool_settings (company_id, connector_id,
  disabled_models_json, updated_at), PK (company_id, connector_id),
  FK companies(id) ON DELETE CASCADE.
- Drop every `settings.disabled_models:*` key — these were the bug's
  residue; there is no right company to attribute them to, so the
  migration clears them. Users re-select on next onboarding.

API surgery — every reader/writer now takes companyId:
- db.getDisabledModels(companyId, connectorId)
- db.setDisabledModels(companyId, connectorId, models)
- db.hasModelPoolSettings(companyId, connectorId)
- connector-model-policy: getConnectorModelPolicy(deps, companyId,
  connectorId); validateConnectorModelSelection(deps, companyId,
  connectorId, model)
- model-dispatch: listEnabledModels(companyId, deps);
  pickModelForAgent resolves companyId from agent.companyId
- orchestration heartbeat/task-runner/turn-context/run-dispatch pass
  the agent's or run's companyId through to the policy deps
- IPC schema: connectorDisabledModelsSchema gains companyId; new
  connectorModelPoolQuerySchema pairs companyId+connectorId for reads

Onboarding becomes commit-on-launch:
- useConnectorModelSelection no longer persists via IPC during
  onboarding. Toggles mutate local state; it exposes `poolSelections`
  to the wizard.
- bootstrapOnboardingSchema gains connectorPoolSelections. The
  onboarding service saves the company first, then persists each
  per-connector disabled list scoped to the new company id — CEO
  model validation runs against the company's freshly-persisted pool,
  not some stale global.
- IPC setConnectorDisabledModels now requires companyId; the only
  consumer was onboarding, which no longer calls it at all.
- Main-side listConnectorModels returns the raw provider catalog
  (no pool filtering), since that IPC is used from onboarding where
  no company exists yet; pool filtering happens at dispatch time.

saveConnector IPC drops the per-company pool validation — connector
config is a global hint, company-scoped enforcement belongs at run
dispatch where the company is known.

Tests: 603/603 green. Typecheck clean. Integration tests rewritten
to set the pool via connectorPoolSelections on bootstrap input, not
a pre-bootstrap global setDisabledModels call.

src/main/connector-model-policy.ts

@@ -4,7 +4,7 @@ import { resolveModels } from "./model-resolver";
 
 interface ConnectorModelPolicyDeps {
   getConnector: (id: ConnectorId) => { id: ConnectorId; label?: string | null; model: string | null };
-  getDisabledModels: (connectorId: string) => Array<{ id: string; label: string }>;
+  getDisabledModels: (companyId: string, connectorId: string) => Array<{ id: string; label: string }>;
 }
 
 export interface ConnectorModelPolicyResult {
@@ -39,11 +39,12 @@ function listProviderModels(provider: string): Array<{ id: string; label: string
 
 export function getConnectorModelPolicy(
   deps: ConnectorModelPolicyDeps,
+  companyId: string,
   connectorId: ConnectorId,
 ): ConnectorModelPolicyResult {
   const connector = deps.getConnector(connectorId);
   const definition = getConnectorDefinition(connectorId);
-  const disabledModels = new Set(deps.getDisabledModels(connectorId).map((model) => model.id));
+  const disabledModels = new Set(deps.getDisabledModels(companyId, connectorId).map((model) => model.id));
 
   const catalog = listProviderModels(definition.provider);
   const enabledModels = uniqueModels(catalog).filter((model) => !disabledModels.has(model.id));
@@ -58,10 +59,11 @@ export function getConnectorModelPolicy(
 
 export function validateConnectorModelSelection(
   deps: ConnectorModelPolicyDeps,
+  companyId: string,
   connectorId: ConnectorId,
   model: string | null | undefined,
 ): { ok: true; effectiveModel: string | null } | { ok: false; error: string } {
-  const policy = getConnectorModelPolicy(deps, connectorId);
+  const policy = getConnectorModelPolicy(deps, companyId, connectorId);
   const selectedModel = model?.trim() || null;
 
   if (policy.enabledModels.length === 0) {