This commit acts on the design review feedback:
1. Eliminates dynamic JSON registry instantiation for pipelines.
2. Introduces TS ContextProfiles for strongly-typed declarative wiring.
3. Converts ContextProcessors to pure functions returned by factories (HOFs) holding local state via closures.
4. Converts ContextWorkers to simple {start, stop} lifecycle objects.
5. Removes now-obsolete registry and JSON parsing overhead from Orchestrator.
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