Function embodify

embodify(input?: EmbodifyInput): EmbodifyChain
Creates an immutable chainable builder with optional initial state.

Accumulate state through EmbodifyChain.set; execute through EmbodifyChain.trace. Each .set() returns a NEW chain — state is never mutated. Errors from .trace() are returned as { ok: false } — never thrown.
Parameters
- input: EmbodifyInput = {}
  Initial state fields (all optional). { tracer?, code?, config? }
Returns EmbodifyChain
A new EmbodifyChain with the provided initial state
Remarks
No validation at creation — .trace() handles all validation. This means you can create a chain with no fields and populate them via .set() before tracing.
Example
```
const chain = await embodify({ tracer: myTracer })
  .set({ code: 'hello' })
  .trace();

if (chain.ok) console.log(chain.steps);

// Re-trace with new code — chain is immutable, original unaffected
const chain2 = await chain.set({ code: 'world' }).trace();
```
- Defined in src/api/embodify.ts:270