fix: address code-level issues from subworker audit

- Remove unused generationProfile parameter from verify runner
- Integrate PluginContractRegistry into petit-runner and stateful-runner
- Add deterministic hashStringToSeed to doctor (replaces Math.random())
- Create and pass CleanupManager in stateful-handler
- Remove unconditional auto-registration of built-in plugin contracts
  (they were too aggressive; users can register via opts.pluginContracts)
- Build: clean | Tests: 849 pass, 0 fail

src/cli/commands/verify/runner.ts

@@ -53,7 +53,6 @@ export interface VerifyRunResult {
 export interface VerifyRunnerDeps {
   fastify: FastifyInjectInstance
   seed: number
-  generationProfile?: 'quick' | 'standard' | 'thorough'
   timeout?: number
   routeFilters?: string[]
   changed?: boolean