Reflection follow-up: rewrite missing substrate file standup-config.md

Missing path: ~/agents/will-engineer/memory/standup-config.md Referenced in: DAILY-STANDUP-PROTOCOL.md lines 266 and 274. The protocol says to check this file at the start of every standup cron — if standup_paused: true it skips silently. Presumed contents: A simple YAML or markdown config file with at minimum a standup_paused field. Example: standup_paused: false. This is a runtime-created file but since DAILY-STANDUP-PROTOCOL.md mandates checking it at every standup cron, its absence means the cron cannot determine if standups are paused. Action: create with standup_paused: false (standups are currently active).