feat(graph): add cascade graph command rendering the pipeline as mermaid - #354
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Signed-off-by: Joshua Temple <joshua.temple@stablekernel.com>
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Adds a read-only cascade graph command that loads the manifest, builds the generated job dependency graph, and emits Mermaid to stdout so it can be piped to a file or pasted into a README.
Flags: --granularity (jobs today; env and stages are recognized and rejected with a clear message so the flag contract is stable for the projections that land in #303), --format (only mermaid; other values fail cleanly), --theme (default for now; the theme layer is #304), plus the standard --config and --manifest-key. The root --json flag wraps the diagram in a structured envelope.
Verification: unit and command tests cover emission, flag handling, JSON wrapping, and the missing-manifest error path. Additive only; no schema or generator-output change; cascade verify is unaffected.
Closes #302.