Function createApp

Orchestrator for the A2-β boot planner pipeline.

Stages:

1. validateManifests — normalise + validate all manifests.
2. planBoot — build dependency graph, detect cycles, compute init order.
3. materializeComponents — run provider factories in topological order.
4. applyContributions — route contributions to collectors.
5. freezeWorld — Object.freeze component map + call freeze() on registries.
6. assembleApp — mount routes, build AppHandle.

Built-in contribution kinds (grants, tokenExchangeValidators, federations, mfaFactors, auditHooks, routes, grantPolicyHooks) are seeded by mergeWithBuiltins; consumer-supplied kinds overlay on top.

The generic B constrains bootstrapComponents to a typed subset of ComponentMap so downstream stages receive a well-typed config/pathResolver.

Per A2-β §6.2 / §6.4.