feat(visualize): pipeline view model, pluggable emitter, and Mermaid emitter - #352
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…emitter Signed-off-by: Joshua Temple <joshua.temple@stablekernel.com>
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Adds a render-agnostic internal/visualize package that projects a generated pipeline's job DAG into an ordered view model, defines a pluggable Emitter interface, and provides a Mermaid emitter as the first implementation.
The view model is built from BuildDependencyGraph and walks Order for deterministic output; a cyclic graph surfaces the existing cycle-detection error rather than panicking. The Mermaid emitter renders a flowchart TD with kind-distinct node shapes and visually distinct hard (solid) versus optional (dotted) edges, and follows the functional-options convention for additive capabilities. This is library code only; the cascade graph CLI command is tracked separately in #302.
Tests: golden-file (validate plus two builds plus two deploys, one optional dependency), determinism (10x identical), structural validity (header present, every edge endpoint declared), and cyclic and nil-graph error paths.
Closes #301.