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feat: Add emit attribute for step-level output control (ADR-0006 Phas… (#85)

* feat: Add emit attribute for step-level output control (ADR-0006 Phase 2)

This commit implements the emit attribute as specified in issue #79,
enabling explicit output key prefixes for workflow steps.

Changes:
- AST: Added Emit field to all step node types (AgentStepNode,
  RouterStepNode, ForeachStepNode, RunStepNode)
- Parser: Added emit YAML field parsing for all step types
- Compiler: Added EmitContext for tracking output prefixes and foreach
  iteration counters
- Compiler: Updated all compiled step structures to include Emit field
- Compiler: Implemented ApplyEmit and ApplyEmitWithCounters functions
  for key transformation
- Workflow: Initialized EmitContext in Job.Prompt execution

Tests:
- Added parser tests for emit attribute parsing across all step types
- Added unit tests for ApplyEmit and ApplyEmitWithCounters functions
- Added tests for EmitContext push/pop operations
- All existing tests pass without regressions

The emit attribute allows multi-stage workflows to organize outputs
into separate directories. For example:
  - uses: prompts/summarize.md
    emit: summary

will transform output keys like 'a.txt' to 'summary/a.txt'.

For foreach steps with counters, keys are transformed with iteration
counters inserted before the file extension:
  emit: research, key: a.txt, iteration: 1 → research/a.000001.txt

Note: This is Phase 2 of ADR-0006. Actual I/O integration with emit
prefixes will be implemented in Phase 3.

* (fix) file formatting

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