merge: P4b S6, paying on terms (branch S6, 6c4480cd)

The third of the paused branches: Ledger::settle with discounts and the
processor's fee (kernel::settle, Kani settle_is_exact, Lean
settle_posts_a_document_step), books.receive_payment and books.pay_bill
with applications, books.bills_due, the agings' detail and tie-out, the
aging exports and the CPA package's aging CSVs, the handlers in
tools/settlements.rs. Twelve files conflicted with the S4.4 and S5
merges, resolved as plan 8.0.2 says: both routers; both test appends
(the shared match arm in arap_standing.rs spliced into both tests; the
shared `.unwrap()` in store.rs); the scope table at 124; one
invoices-and-bills handbook (S5's send step 1 with S6's steps 2, 3, 5
and procedures) registered once; docs/mcp-interface.md with S4.4's
create docs and S6's payment docs; S5's law renumbered 35 and S6's 36
(S1's is 34); the parity rows and sections of both. S6's wire tests
create their bills as S4.4's contract now requires (confirmed, the
vendor's number, a line account, the vendor's invoice uploaded) and live
in their own module beside S4.4's tests.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01HS8WZziDnyxunC23MUxrLp

crates/ledger-mcp/src/scopes.rs

@@ -56,7 +56,7 @@ const C: Needs = PostWhenConfirmed;
 const K: Needs = PostForApprovalRules;
 
 /// Every tool and what it needs (INVARIANT 1).
-pub const TABLE: [(&str, Needs); 123] = [
+pub const TABLE: [(&str, Needs); 124] = [
     ("books.handbook", R),
     ("books.start", R),
     // Settings are committed at once: the settings commit of the plan.
@@ -173,6 +173,7 @@ pub const TABLE: [(&str, Needs); 123] = [
     ("books.document", R),
     ("books.ar_aging", R),
     ("books.ap_aging", R),
+    ("books.bills_due", R),
     ("books.set_fx_rate", W),
     ("books.run_payroll", P),
     ("books.remit_payroll_taxes", P),