refactor(graphviz): move graph_render module from fabro-workflows to fabro-graphviz

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Cargo.lock

@@ -1474,6 +1474,7 @@ dependencies = [
 name = "fabro-graphviz"
 version = "0.176.2"
 dependencies = [
+ "anyhow",
  "nom",
  "regex",
  "serde",

lib/crates/fabro-api/src/server.rs

@@ -1510,7 +1510,7 @@ async fn get_retro(
 
 /// Render DOT source to a styled SVG via `render_dot` on a blocking thread.
 pub(crate) async fn render_dot_svg(dot_source: &str) -> Response {
-    use fabro_workflows::graph_render::{render_dot, GraphFormat};
+    use fabro_graphviz::render::{render_dot, GraphFormat};
 
     let source = dot_source.to_owned();
     match tokio::task::spawn_blocking(move || render_dot(&source, GraphFormat::Svg)).await {

lib/crates/fabro-cli/src/commands/graph.rs

@@ -68,7 +68,7 @@ pub fn run(args: &GraphArgs, styles: &Styles) -> anyhow::Result<()> {
 
     let source = read_workflow_file(&dot_path)?;
     let source = apply_direction(&source, args.direction);
-    let rendered = fabro_workflows::graph_render::render_dot(&source, args.format.into())?;
+    let rendered = fabro_graphviz::render::render_dot(&source, args.format.into())?;
 
     if let Some(ref output_path) = args.output {
         std::fs::write(output_path, &rendered)?;
@@ -91,7 +91,7 @@ pub enum GraphOutputFormat {
     Png,
 }
 
-impl From<GraphOutputFormat> for fabro_workflows::graph_render::GraphFormat {
+impl From<GraphOutputFormat> for fabro_graphviz::render::GraphFormat {
     fn from(value: GraphOutputFormat) -> Self {
         match value {
             GraphOutputFormat::Svg => Self::Svg,

lib/crates/fabro-graphviz/Cargo.toml

@@ -9,6 +9,7 @@ description = "Graphviz DOT parser and typed graph data model"
 doctest = false
 
 [dependencies]
+anyhow.workspace = true
 nom = "7"
 regex = { workspace = true }
 serde = { workspace = true }

lib/crates/fabro-graphviz/src/lib.rs

@@ -3,6 +3,7 @@ pub mod error;
 pub mod fidelity;
 pub mod graph;
 pub mod parser;
+pub mod render;
 pub mod stylesheet;
 
 pub use fidelity::Fidelity;

lib/crates/fabro-workflows/src/lib.rs

@@ -95,21 +95,19 @@ pub mod checkpoint;
 pub mod conclusion;
 pub mod condition;
 pub mod context;
-pub mod graph;
-pub mod lifecycle;
-pub mod node_handler;
 pub mod cost;
 pub mod devcontainer_bridge;
 pub mod error;
 pub mod event;
 pub mod git;
+pub mod graph;
 pub mod graph_ops;
-pub mod graph_render;
 pub mod handler;
+pub mod lifecycle;
+pub mod node_handler;
 pub mod operations;
 pub mod outcome;
 pub mod pipeline;
-pub mod preamble;
 pub mod pull_request;
 pub mod run_dir;
 pub mod run_lookup;