0.3.0

ADR-0020 Store Receipts, status Proposed, P0 only (StoreReceipt, close_receipt, schema). Does not flip recertia backup or tabletop. Accept only after a counted soak week compares tar vs. receipt restore. P1–P5 not started.

PR #53: docs only. Cite Recuris (Yu et al., arXiv:2608.24876, 25 Aug 2026) as closest published sibling, and absorb four score-9 papers into docs/references.md. Confirm; do not reshape T3. No new node, no remaining-work row.