The `registerCredentialIpcHandlers` and `registerOAuthIpcHandlers`
entry points existed in `ipc-credentials-handlers.ts` and
`ipc-oauth-handlers.ts` but were never called — `registerHandlers()`
in `main-runtime-support.ts` only wired `registerCoreHandlers` and
`registerDomainHandlers`. The result: every renderer call to
`credentials:list` / `credentials:save` / `credentials:remove` /
`credentials:test` / `oauth:start` / `oauth:cancel` /
`oauth:prompt-response` / `oauth:manual-code-response` crashed
with "No handler registered".
Wire both handler families against the PiRuntimeServices container
(credentialStore, credentialResolver, oauthLoginService) already
exposed via `serviceGraph.getPiRuntime()`. The refreshConnectorHealth
callback reuses the existing connectorHealthService so status
badges flip between `ready` and `auth_required` immediately after
a save/login.
typecheck 0 / lint 0-0 / build 0-0 / test:unit 508/508 preserved.
- Create ipc-budget-handlers.ts with 6 budget channel handlers (save/delete/list policies, list/resolve incidents, get status)
- Add budgetService to RegisterDomainHandlersDependencies interface
- Register budget handlers in ipc-domain-handlers.ts composition
- Add BudgetEnforcementService lazy slot in service-graph.ts with getOrCreateBudgetEnforcementService
- Pass budgetService to domain handler registration in main-runtime-support.ts
- Fix preload bridge to pass {companyId} object for listBudgetPolicies and getBudgetStatus
- D-06: checkAutoResolve called on saveBudgetPolicy to auto-resolve incidents on limit increase
ZacharyZhang-NY