P3: the cash flow statement by ASC 230 (defect 1, D-35, D-42)

Direct method with the operating reconciliation and noncash schedules; it
foots by construction (Lean and Kani). Every non-cash account belongs to
one section; reversals net; a member or lender paying for the company is
cash borrowed and spent (D-42, constructive receipt and disbursement);
property a member contributes stays noncash. The bookspec seed: one loader
checks every example.

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

crates/ledger-config/src/lib.rs

@@ -38,7 +38,8 @@ pub struct BooksSettings {
     pub cash_accounts: Vec<String>,
     /// `[books] financing_accounts`: liability account codes the cash flow
     /// statement treats as financing (loans, and what owners advanced:
-    /// ASC 230-10-45-14(b)). Empty: callers decide.
+    /// ASC 230-10-45-14(b)); equity is financing unlisted. Empty: other
+    /// liabilities are operating (the statement never guesses from names).
     pub financing_accounts: Vec<String>,
     /// `[books] investing_accounts`: asset account codes the cash flow
     /// statement treats as investing (loans the company makes, investments