config, mcp, gui: specs from sources, spec-blind suites, and the bugs they found

ledger-config: parse gets a sourced spec. A fiscal year starts on the
first of a month (IRS Pub. 538); tax_classification is read by whole
words (Treas. Reg. 301.7701-3, Schedule C instructions; "business corp"
no longer reads as an S corp, "corporation or S corporation" is refused);
duplicate or blank members and shared capital accounts are refused; a
negative or non-grammatical receipt threshold is refused; codes trimmed.
tests/spec_config.rs (65 spec-blind tests, 14 properties), fuzz target
fuzz_config_parse (weekly). Mutation: 55 of 55 viable caught (from 25/38).

The receipt policy moves to ledger-config, with one loader
(effective_receipt_policy) and one decimal grammar, so the server and
the viewer enforce and show the same rule (the viewer had its own: only
expense-like debits, a silent $25 default, and no config.json).

ledger-mcp: a module spec (MCP 2025-06-18 tools, JSON-RPC 2.0, the
operating contract). Amounts in are exactly -?digits[.digits]; a number
that is one account's code and another's id (vendors, classes alike) is
refused, not guessed; the threshold is validated at startup. Fixed:
add_line with a bad class journaled the line before refusing;
profit_and_loss_by_class ignored `class`; aging buckets said "0". A wire
in front of rmcp answers malformed JSON with -32700 and invalid requests
with -32600 and their id (rmcp dropped the first, omitted the id).
tests/spec_mcp.rs (26 spec-blind tests: every tool's result against its
own outputSchema, a random-call state machine checking the journal is
untouched by every refusal, amount grammar, previews, the receipt policy).

ledger-gui: money, accounting, and dollars never round (they rounded to
cents, banker's style); export file names avoid Windows device names,
trailing dots and spaces, empty names, and 255-byte overflow; specs on
attention, history, fuzzy search, and axis ticks.

ledger-core: the lifetime profit_and_loss is renamed unclosed_earnings
(docs/testing.md #3).

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

crates/ledger-core/tests/statements.rs

@@ -15,7 +15,7 @@
 
 use chrono::NaiveDate;
 use ledger_core::reports::{
-    balance_sheet, balance_sheet_as_of, profit_and_loss, profit_and_loss_for_period,
+    balance_sheet, balance_sheet_as_of, profit_and_loss_for_period, unclosed_earnings,
 };
 use ledger_core::{
     AccountId, AccountType, CashFlowParams, ClassId, Currency, Ledger, LedgerError, MemberCapital,
@@ -127,7 +127,7 @@ fn profit_and_loss_is_scoped_to_the_period() {
         (dec(3_500), dec(920))
     );
     // ... which is the life-of-ledger P&L, because nothing is outside it.
-    let all = profit_and_loss(&b.ledger).unwrap();
+    let all = unclosed_earnings(&b.ledger).unwrap();
     assert_eq!((all.revenue, all.expenses), (dec(3_500), dec(920)));
 
     // One class: only the tagged software line.