Initial commit: wanderbooks accounting semantics engine

plan/STATUS.md

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+# STATUS — 2026-10-10
+
+## Where we are
+
+Phase 1 (semantics core) is underway. The repo exists, is private, and the
+first engine slice is built, tested, and green.
+
+**Done:**
+- Repo `swaits/wanderbooks` created on git.swaits.com (private).
+- `ledger-core` 0.1.0: `Money` (exact Decimal + ISO currency), five account
+  types with normal sides, chart of accounts (codes, hierarchy,
+  placeholders), journal entries with full validation, `Ledger` command
+  surface (create/add-line/post/reverse), append-only posting log.
+- Reports: trial balance, P&L, balance sheet (accounting equation holds;
+  current earnings folded into equity pre-close), canonical JSON `snapshot()`
+  for oracle diffing.
+- 14 tests green: validation rejections, posted-entry immutability,
+  reversal semantics, the accounting laws on a fixture company, a 300-entry
+  randomized invariant test, and the first golden file.
+- Docs: AGENTS.md (operating manual), requirements, architecture, oracle
+  design, parity catalog (floor: 6 done), glossary. Plan: this file + roadmap.
+
+**In progress:** nothing — the next arcs are queued below, unstarted.
+
+## Next arcs (in order)
+
+1. **Period close** (R-FUTURE-2): fiscal periods, closing entries moving P&L
+   to retained earnings, locked periods. Parity: balance sheet then reports
+   retained earnings instead of folded current earnings.
+2. **Cash flow, indirect method** (R-FUTURE-3): from P&L + balance-sheet
+   deltas. Golden-covered.
+3. **Property tests graduate**: `proptest` with shrinking for the randomized
+   invariant test; new properties for close and cash flow.
+4. **GnuCash XML import** (R-FUTURE-4, read-only): parse GnuCash files into
+   fixture books. This unblocks the oracle harness.
+5. **Oracle harness** (`ledger-oracle`, `cargo xtask oracle`): run fixture
+   books through our engine and GnuCash headless, diff snapshots
+   automatically. Parity catalog becomes machine-checked; CI enforces the
+   floor.
+6. **egui app shell** (`books-app`): command-driven UI, native + WASM,
+   screenshot-in-the-loop per the storytold protocol. Workflow parity catalog
+   (QuickBooks/Xero reference) starts here.
+
+## Decisions log
+
+- 2026-10-10: Single currency per ledger for day one (R-5). Multi-currency
+  is designed-for, not built.
+- 2026-10-10: `Money` arithmetic is checked and returns `Result`; no
+  panicking ops, no float paths anywhere.
+- 2026-10-10: Negative zero is normalized away at `account_balance` — money
+  never prints "-0". (Caught by the golden test on day one; the oracle works.)
+- 2026-10-10: License MIT OR Apache-2.0, matching the storytold projects.
+  GnuCash clean-room boundary documented in `docs/oracle.md`.