refactor: cleanup BuildOptions and builders module

[solidsnakedev]

Summary

Cleanup of the builders module - removes dead code, duplicate documentation, and stale comments.

Changes

• Remove unused `useStateMachine` build option - Defined but never read
• Add NOTE for `maxUtxosToConsolidate` - Documents future consolidation feature in Unfrack
• Remove commented-out code - Old PhaseContextTag/TxContext remnants
• Remove duplicate JSDoc comments - Consolidated 6 duplicate comments to 2 (TxBuilderState, TxContext)
• Remove stale comments in index.ts - Referenced non-existent files (BuildTypes.ts, BuildContext.ts, BuildHelpers.ts)

[Copilot]

Pull request overview

This PR performs cleanup and refactoring of the builders module by removing dead code, stale comments, and duplicate documentation.

Changes:

• Removed unused useStateMachine build option that was defined but never read
• Added implementation NOTE for maxUtxosToConsolidate feature
• Removed commented-out code and duplicate JSDoc comments

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/evolution/src/sdk/builders/index.ts	Removed stale comments referencing non-existent files
packages/evolution/src/sdk/builders/Unfrack.ts	Added NOTE clarifying that maxUtxosToConsolidate is not yet implemented
packages/evolution/src/sdk/builders/TransactionBuilder.ts	Removed unused useStateMachine option, commented-out code, and consolidated duplicate JSDoc comments

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