ai-coding-context

docs: add loop engineering discipline

feat: enforce subagent review for plan and code review (moderate+)

chore: hardening pass — set -euo pipefail, cross-platform fix, test coverage, keyword alignment

chore(workflow): Round 10 P0 — flow rigor (plan-review reminder + spec_id)

docs(decisions): record 0037 round10 P0 flow rigor