refactor(ir): reduce complexity of add_edges_from_job in graph.rs

[github-actions]

Summary

add_edges_from_job in src/compile/ir/graph.rs repeated the same
collect→for→add_edge_for_ref pattern inline inside every match arm,
creating 4 levels of nesting and making the intent hard to read.

What changed

Extracted two focused private helpers:

• add_edges_for_condition — takes an Option<&Condition> and adds
  graph edges for all OutputRefs found inside it.
• add_edges_for_env — takes an iterator of &EnvValue and adds
  graph edges for all StepOutput references.

add_edges_from_job now delegates to these helpers; each match arm is
≤ 2 lines.

Before / After

	Before	After
Lines in add_edges_from_job	52	30
Max nesting depth	4	2
Repeated for-loop bodies	4	0

Verification

• cargo test — all tests pass
• cargo clippy --all-targets --all-features — clean

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Generated by Cyclomatic Complexity Reducer · 60.8 AIC · ⌖ 12.3 AIC · ⊞ 7.2K · ◷

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