Fix: preserve creator edges in deps_viewer reduced and omitted modes

[indigo1973]

Preserve source=creator edges during transitive reduction because they
encode tensor lifetime retention rather than redundant scheduling
dependencies. Continue reducing transitively covered explicit and
tensormap edges.

Pass edge annotations into the reduction logic, add regression coverage
based on the vector_example dependency pattern, and update the
deps_viewer documentation.

[coderabbitai]

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📝 Walkthrough

Walkthrough

deps_viewer now performs annotation-aware transitive reduction: creator-sourced tensor lifetime edges are preserved, while redundant tensormap shortcuts remain removable. CLI documentation and unit tests were updated for the new behavior.

Changes

Lifetime-aware dependency reduction

Layer / File(s)	Summary
Lifetime-aware reduction semantics simpler_setup/tools/deps_viewer.py, simpler_setup/tools/README.md	Structural reduction now protects edges annotated with source=creator, while reduced and omitted modes pass annotations into the reducer and document cycle handling.
Reduction behavior tests tests/ut/py/test_deps_viewer.py	Test helpers support per-edge sources, and tests cover removal of tensormap shortcuts and retention of creator references.

Estimated code review effort: 2 (Simple) | ~10 minutes

Poem

I’m a bunny guarding edges bright,
Creator threads stay tucked in tight.
Shortcuts hop away in twos,
Tests leave footprints in the views.
Lifetime safe, the graph can glow!

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: preserving creator edges in deps_viewer reduced and omitted modes.
Description check	✅ Passed	The description matches the implemented change by explaining creator-edge preservation, continued reduction of other edges, tests, and docs.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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[gemini-code-assist]

Code Review

This pull request updates the transitive reduction logic in deps_viewer.py to preserve tensor-lifetime edges (where source=creator) while continuing to reduce redundant scheduling edges. It also updates the CLI help, documentation, and adds unit tests to verify this behavior. The review feedback suggests adding a defensive type check when parsing annotations to prevent potential AttributeError exceptions from malformed data.

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