feat(cmd/crucible): render SVG/PNG via embedded Graphviz with a Forge theme#185
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… theme render gains -format svg|png (alongside dot|mermaid) and -o. Images render in-process through goccy/go-graphviz (Graphviz compiled to WebAssembly via wazero), so no external Graphviz install is needed. The CLI applies the Forge/Crucible brand (ember borders, copper edges, charcoal text) by injecting DOT default attributes before rendering; ownership fills and final-state rings are preserved. The dependency lives only in cmd/crucible. The state engine is untouched and stays stdlib-only; the README and a new THIRD_PARTY_NOTICES.md scope the "stdlib-only" guarantee to the library and attribute go-graphviz (MIT) and the bundled Graphviz (EPL). Closes #176.
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Closes #176.
What
crucible rendergains-format svg|png(alongsidedot/mermaid) and-o. Images render in-process viagoccy/go-graphviz(Graphviz compiled to WebAssembly, run throughwazero) — no external Graphviz install required.The CLI applies the Forge/Crucible brand (ember borders, copper edges, charcoal text) by injecting DOT default attributes before rendering; state's per-node ownership fills and final-state rings are preserved.
Dependency & the "stdlib-only" claim
The dependency lives only in
cmd/crucible(a leaf binary). Thestateengine is untouched and stays stdlib-only. This PR makes the README's "stdlib-only / no forced dependencies" language precise — it's a guarantee about the library you import, with the CLI tool the one disclosed exception — and addsTHIRD_PARTY_NOTICES.mdattributing go-graphviz (MIT) and the Graphviz it bundles (EPL).goccy/go-graphvizis MIT, CGO-free (WASM via wazero — the same runtime thewasmmodule already uses). It pinswazero v1.10.1; thewasmmodule uses v1.12.0 — separate workspace modules, no conflict.Verification
state: unchanged (1113 tests still pass).cmd/cruciblein-workspace: build/vet/test (94)/golangci-lint — all green.cmd/cruciblestandalone (GOWORK=off): build + test green — i.e.go install-style consumers work.svgoutput contains<svgand the brand colors reach the SVG;pngwrites valid PNG (magic bytes) to-o/stdout;jpg/unknown → usage error; thedot/mermaidtext output is unchanged.