Extract all 29 full digraph workflows from docs into test/docs/ with
an extraction script, assemble 7 snippet DOTs from reference pages,
and add a runner script for validate/dry-run/haiku/full phases.
Docs fixes:
- definition-of-done: replace multi-word condition values with
underscored equivalents (parser doesn't support spaces), make
safe-default edges unconditional for fallback coverage
- semantic-port: make fallback edges unconditional on fetch/analyze
nodes so validator doesn't reject all-conditional-edge nodes
All 36 DOTs pass `arc validate`.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
