test: add coverage for graph_query render_text and render_dot

[github-actions]

Test Gap Fixes

Test suite snapshot: 2,813 tests (unit + integration), 7 tests in inspect_integration (was 5)

Added Coverage

Module	Function/Path	Why It Matters	Test Added
inspect/graph_query.rs	render_text — all text sections	render_text is a public pure function with 0 existing tests; exercises Step locations, Job edges, Job step counts, and Outputs-needing-isOutput sections	graph_text_emits_expected_sections_for_standalone_pipeline
inspect/graph_query.rs	render_dot — PipelineBodySummary::Stages branch	The DOT subgraph-cluster path was unreachable from the existing graph_dot_emits_digraph_with_known_edges test (which only uses a standalone / flat-jobs fixture); the Stages arm was dead coverage	graph_dot_emits_subgraph_clusters_for_stage_template

Validation

• cargo test --test inspect_integration — 7/7 pass
• cargo clippy --all-targets --all-features — clean

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This PR was created by the automated test gap finder. Previous run: none (first run). Modules audited this cycle: sanitize, validate, fuzzy_schedule, secure, hash, ndjson, agent_stats, execute, compile/filter_ir, compile/pr_filters, compile/path_layout_check, compile/source_path_guard, compile/gitattributes, compile/codemods, inspect/graph_query, inspect/graph_deps, inspect/graph_outputs, inspect/lint, inspect/whatif.

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