Write & POST July 22 standup to Slack (12:15-13:45 UTC window) — queue-for-N+2, substrate_leak_scrub

Standup for July 22 2026. Trigger 2026-07-22T12:30Z. Compose in memory/standups/2026-07-22.md then Slack send to Carson DM (D0B0980TR88). Apply COMPOSE_GUARD_DO_NOT_SEND substrate_leak_scrub before send (drop or move to result.substrate_notes any line matching /Cross-context|substrate|binding denied|retry_count|heartbeat recovery|poison[- ]?pill|lease[- ]?expired|webchat.?slack/i). Report Kai-owned active PRs, open PR count metric basis, any Carson-blocking items, PR #13124 and #13255 states if still open, and BOLT-1439 gate only if state changes. Runtime N+2 queue-for-N+2 rule: on complete, queue July 24 standup. Aim delivery inside 12:15-13:45 UTC window; do not alter this basis before the 2026-08-15 moratorium expires.