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-gui/src/attention.rs

@@ -12,6 +12,30 @@ use ledger_core::reports::profit_and_loss_for_period;
 use ledger_core::{AccountType, EntryStatus, PeriodStatus, vendor_1099_report};
 use rust_decimal::Decimal;
 
+/// Everything the books need, as items to show.
+///
+/// ```text
+/// GOAL: tell the humans what's unfinished or wrong, and hand them the
+///       prompt that gets the agent to fix it; never change the books.
+/// SOURCE: DECISION (owner: the viewer is read-only; its "Needs
+///         attention" list offers prompts, AGENTS.md); the conditions
+///         below; docs/spec/sources/irs-1099-thresholds.md (W-9s).
+/// INVARIANTS:
+///   1. Pure: reads `b`, writes nothing.
+///   2. One item per: draft entry (Todo); posted entry missing a receipt
+///      (Problem; four or more are one combined item); recurring entry or
+///      schedule due through today (Todo); period ended and still open
+///      (Todo); fiscal-year account with activity and no tax category
+///      (Info); legal rule known only through a past year (Todo); 1099
+///      vendor without a W-9 (Problem); overdue bills, and overdue
+///      invoices (Problem, one each, with the total); money owed to
+///      owners (Info, per account with a balance); the database differing
+///      from the journal or unreadable, and damaged or missing stored
+///      files (Problem).
+///   3. Nothing else: books with none of those yield no items.
+///   4. Every item's prompt starts "In wanderbooks," or names
+///      wanderbooks, and its amounts are the books' exact amounts.
+/// ```
 pub fn find(b: &Books) -> Vec<Attention> {
     let mut out = Vec::new();
     let today = b.today;
@@ -49,9 +73,9 @@ pub fn find(b: &Books) -> Vec<Attention> {
             .collect();
         out.push(Attention {
             severity: Severity::Problem,
-            title: format!("{} without receipts", fmt::count(missing.len(), "expense", "expenses")),
+            title: format!("{} without receipts", fmt::count(missing.len(), "entry", "entries")),
             detail: format!(
-                "{} of spending has no receipt attached ({}).",
+                "{} in entries with no receipt attached ({}).",
                 fmt::dollars(total),
                 b.receipt_rule()
             ),