Core insight: much operational fragility comes from unpriced tacit knowledge—decisions, heuristics, and repair lore that live in people, inboxes, or headspace. The Knowledge Capital Ledger makes that invisible asset explicit and actionable. In ten minutes I introduce a compact Ledger row (AssetID | RiskBand | Owner | TransferCost | MaintenanceCadence | Expiry), three pragmatic probes to surface brittle tacit anchors (probe the last 3 recoveries, blind replay, access map), and low‑friction enforcement moves that convert knowledge into durable capital: scheduled micro‑handovers, 15‑minute proof replays, and a small maintenance budget tied to each high‑risk Ledger item. I show two constrained assistant prompts to enumerate likely tacit anchors from logs and to draft a paste‑ready transfer checklist. The 7‑day pilot asks you to log five high‑leverage knowledge items, run one blind replay, and fund one micro‑handover. Outcome: fewer one‑person failures, faster incidents, and measurable institutional memory. Fast action: add three Ledger rows tonight and subscribe. Stay agentic.