Fix Seed-OSS grammar allowing unlimited newlines
- Limit newlines around <seed:eos> to max 2 (was unlimited)
- Replace content_after with limited post_tool_gap (max 2 newlines)
- Limit pre_eos_gap to max 2 newlines
- Enforce required parameters for non-string types in grammar
- Add README.peg.md documenting PEG parser limitations
This fixes the issue where the grammar allowed unlimited newlines,
causing models to generate endless whitespace until hitting the
token limit (finish_reason: "length" instead of "tool_calls").
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
