feat: integrate command-based executor into build pipeline

[Copilot]

CommandTransform and the YAML transform loader were fully implemented but never wired into the application, causing cargo clippy -- -D warnings to fail with 9 dead-code/unused-import errors in CI.

Changes

• src/config.rs – Added optional transforms: Option<String> field to Config. Points to a YAML file defining additional command-based transforms (ImageMagick, Pandoc, etc.) to run after the standard pipeline.

• src/commands/build.rs – Loads the YAML command registry once before the format loop, applies it after the standard pipeline (emoji → variables → syntax highlight) in the cache-miss branch. Inherits FailFast/ContinueOnError from the resilient flag.

• src/transforms/mod.rs – Pruned unused pub use re-exports (CommandTransform, YamlTransformConfig, YamlTransformDef, parse_transforms_from_str). Binary crate only needs load_transforms_from_yaml externally; the rest are used internally via the call chain.

Usage

# renderflow.yaml
outputs:
  - type: pdf
input: document.md
transforms: transforms.yaml  # optional; omit if no command transforms needed

# transforms.yaml
transforms:
  - name: pandoc-md-to-html
    program: pandoc
    args: ["{input}", -o, "{output}"]
    from: markdown
    to: html
    cost: 0.5
    quality: 0.9

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