P2 slice 6: the viewer

`wanderbooks gui [BOOK]` finds the data root, reads settings from the
journal, the vault of the book, presence through ops/, Save a copy /
Open on every document, Save the W-9, the Export menu, and colour
schemes. One builder for the CPA package and the 1099 worksheet
(ledger-package), shared by the server and the viewer.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj

crates/ledger-package/src/lib.rs

@@ -0,0 +1,46 @@
+//! The CPA handoff package, and the reports, worksheets, and text helpers
+//! the server's tools and the viewer both make: built from the books
+//! read-only, through [`PackageBooks`] (the server's
+//! [`ledger_store::Store`], the viewer's [`ledger_store::Snapshot`]).
+//!
+//! ```text
+//! GOAL: the server (books.export_cpa_package, books.vendor_1099) and the
+//!       viewer make the same package and the same 1099 worksheet, byte
+//!       for byte, from one piece of code, and neither can change the
+//!       books making them.
+//! SOURCE: the books.export_cpa_package and books.vendor_1099 contracts
+//!         (ledger-mcp server.rs; docs/mcp-interface.md), moved here
+//!         unchanged so the viewer, which reads the books only through a
+//!         Snapshot and doesn't depend on ledger-mcp, builds them too.
+//! INVARIANTS:
+//!   1. Read-only: nothing here writes anywhere (the books, the vault, a
+//!      file). The builders return bytes; recording a file that holds
+//!      full TINs (ledger-mcp tin_files.rs) and handing it over are the
+//!      caller's.
+//!   2. Full TINs come only from the TIN source the caller gives
+//!      ([`TinSource`]); without one, a worksheet carries last fours only.
+//!   3. The same books, settings, and request give the same bytes,
+//!      whichever [`PackageBooks`] they are read through.
+//! ```
+
+mod books;
+mod iif;
+mod package;
+mod reports;
+mod text;
+mod tins;
+mod vendor_1099;
+
+pub use books::PackageBooks;
+pub use iif::export_iif;
+pub use package::{Package, PackageRequest, build_package, package_file_name};
+pub use reports::{
+    Settings, bs_statement, cash_flow_for, cash_flow_statement, member_capitals, pnl_statement,
+    report_members, report_meta, statement_range, year_earnings,
+};
+pub use text::{csv_escape, money, parse_date, share_text};
+pub use tins::{TinSource, tin_kind, tin_type_key, vault_tin};
+pub use vendor_1099::{
+    Vendor1099Worksheet, Vendor1099WorksheetLine, form_1099_label, payment_accounts,
+    vendor_1099_csv, vendor_1099_csv_name, vendor_1099_report, vendor_1099_worksheet,
+};