Fixes#179.
## Summary
- `fabro validate`'s DOT parser rejected multi-line node attribute
blocks unless every attribute was comma-separated, forcing long node
definitions onto a single line.
- Per the DOT spec, the separator between attributes is optional —
whitespace (including newlines) alone is sufficient, and `,` or `;` are
both accepted as explicit separators.
- `attr_block` now uses `many0(terminated(attr, opt(',' | ';')))`
instead of `separated_list0(',', attr)`, so all three forms parse
identically.
## Before / after
```dot
// previously rejected — now parses
inspect [
label="Inspect Code"
shape=tab
prompt="@prompts/inspect.md"
class="heavy"
reasoning_effort="high"
]
```
## Test plan
- [x] Added regression test `parse_attr_block_multiline_without_commas`
covering the exact form from #179.
- [x] `cargo nextest run -p fabro-graphviz` — 109/109 pass, including
the new test and existing comma-separated multi-line tests.
- [x] `cargo +nightly-2026-04-14 clippy -p fabro-graphviz --all-targets
-- -D warnings` clean.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Nate Aune <118984+natea@users.noreply.github.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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