When the architect processes human answers to design questions (answer_parsing step),
it now resumes the session from the research/questions run instead of starting fresh.
This preserves Claude's deep codebase understanding from the research phase, ensuring
sub-issues include specific file references and implementation details.
Changes:
- architect-run.sh: Added detect_questions_phase() to check if PR is in questions phase
(has `## Design forks` section and question comments). If so, resume the session
from SID_FILE to preserve context.
- formulas/run-architect.toml: Documented session resumption behavior in answer_parsing step.
Session is only preserved when PR is in questions-awaiting-answers phase. Fresh sessions
are started for new pitches (no stale context from old sprints).
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