Parties, attachment links, statements, reconciliations (store), TIN vault crate

Parties: one directory for vendors, contractors, customers, employees,
members, platforms, agencies, banks, landlords (ledger-core parties.rs).
W-9/W-4 facts without the number (last four only; any nine-digit run in a
party field is refused, Treas. Reg. 301.6109-4). Vendor and customer
records link to parties on replay; core tags every bill, invoice, payment,
and reversal with its counterparty. Journal events party.*,
entry.party_set; payroll lines name the employee party.

MCP: books.add_party, update_party, set_party_roles, set_w9, set_w4,
parties, party, set_entry_party; draft_entry party; run_payroll employee;
show party. Viewer: Parties directory and party pages, search, journal
text, W-9 attention, demo data.

One definition of a party's money (ledger_core::parties::activity) for
MCP and viewer. 1099 amounts count payments from cash and financing
accounts (a member paying for the company counts; a card doesn't; a
prepayment counts when made): vendor_1099_report_with, B-19.

Store: attachment links to any subject, statements, reconciliations
(schema v11), with replay and projection. ledger-vault: encrypted TIN and
W-9 records (ChaCha20-Poly1305, key file outside the books).

Spec-blind tests for parties (core, store, MCP, viewer) and attachments.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01GWVo7x3UHw5kwCUaWxiejX

crates/ledger-cli/tests/init.rs

@@ -368,11 +368,12 @@ fn the_toml_shows_every_setting_the_config_reads() {
     // Read from the config crate's serde structs, so a new setting there
     // fails here until the template shows it.
     let src = include_str!("../../ledger-config/src/lib.rs");
-    assert_eq!(fields(src, "BooksToml"), ["company", "books"]);
+    assert_eq!(fields(src, "BooksToml"), ["company", "books", "vault"]);
     for (strukt, sect) in [
         ("CompanyToml", "company"),
         ("MemberToml", "company.members"),
         ("BooksSection", "books"),
+        ("VaultSection", "vault"),
     ] {
         for key in fields(src, strukt) {
             if strukt == "CompanyToml" && key == "members" {