feat(daily-prep): add 5-day look-ahead, daily big-ball, and decline gate

I folded in three additions from the Manager Tools prep research. Phase A now fetches the prep day plus the next 5 days, and a new Phase 1 sub-section scans that window for meetings that need prep, scheduling traps, and focus blocks to protect. It's a scan-and-flag pass that feeds Heads-up and Anchor Tasks, not a new prep-doc section. Phase 3 sub-step 3a pulls one important-but-not-urgent task per day for a 15-minute chunk, so strategic work lands in small daily pieces instead of getting displaced by the urgent. Phase 1 item 5 reframes "attend" as "contribute" and adds a send-regrets gate for meetings with no objective. The look-ahead's meeting-prep references stay conditional ("where the project has one") since meeting-prep is project-only for now.

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