Deepen repo graph view interface

[jwalin-shah]

Summary

• Add a concrete RepoGraphView facade that owns repo graph loading, adjacency, search, direct-import formatting, dependency checks, and report rendering.
• Route dependency_report() and repo_graph_repl() through the facade so callers no longer duplicate adjacency construction or direct-import formatting.
• Update the focused repo graph test to exercise the facade instead of helper assembly trivia.

Validation

• PASS: python3 -m pytest tests/test_tensor_logic_core.py::TensorLogicCoreTest::test_repo_graph_helpers_and_report -q
• PASS: git diff --check
• FAIL: python3 -m pytest -q currently has 2 failures in Program.query arity-message assertions unrelated to this repo_graph_view change: tests expect "edge expects 2 symbols..." but current code raises "relation 'edge' expects 2 args...".

Residual Risk

• Full-suite validation is blocked by the existing Program.query assertion/message mismatch outside the owned repo-graph surface.

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