feat: entity-aware owner equity — chart templates, draws, distributions, dividends

Every business has owners, and how owners put money in and take it out
depends on what the business is. wanderbooks now knows the four common
US shapes:

- books.chart_template {entity_type, owners}: a starter chart for a sole
  proprietorship (owner's capital and draws), partnership or
  multi-member LLC (capital and distributions per partner, guaranteed
  payments), S corporation (stock, APIC, shareholder distributions,
  officer compensation, retained earnings) or C corporation (dividends,
  income tax expense), plus common income and expense accounts with
  tax categories, and the wanderbooks.toml settings that go with it
  (tax form, members with equal-share placeholders that sum to exactly
  100, close target). A proposal for the agent to review with the human.
- Closing: CloseTo is now RetainedEarnings { sweep }, Account { into,
  sweep } (a sole proprietor's capital) or Members([MemberClose { capital,
  share, distributions }]). Sweeps zero owner-pay equity accounts into
  their target at close: draws into owner's capital, dividends or
  distributions into retained earnings, each partner's distributions
  into their own capital. Validation (equity, distinct, shares sum to 1)
  runs in the pre-close preview, before anything is journaled. The
  journal records the target; journals with no target or the old
  "retained_earnings" string still replay.
- Members' equity: a partner's distributions account is part of their
  capital; its activity reports as distributions.
- Config: members' distribution_account; [books] close_into and
  close_sweep for single-owner businesses (rejected alongside members).
  The cash flow names members on their distribution accounts too.

Tests: a sole proprietor (net 2,000 and 500 of draws into capital: 6,500,
the cash); a corporation (dividends 300 into retained earnings: 600); a
partnership with distribution accounts (Bob 100 + 25 - 20 = 105, swept at
close, February begins there); bad sweep accounts; templates round-trip
through the chart parser, unique codes, equity per entity, every tax
category valid for the entity's return; stdio: template -> settings ->
import -> postings -> close with the exact closing lines.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MtYEaR6M6Ybdhm6X98BWNu

crates/ledger-mcp/tests/mcp_stdio.rs

@@ -139,7 +139,7 @@ fn mcp_end_to_end_over_stdio() {
     // Tool listing: 23 narrow tools, chart is read-only.
     let list = mcp.request("tools/list", json!({}));
     let tools = list["result"]["tools"].as_array().unwrap();
-    assert_eq!(tools.len(), 52, "expected 52 tools, got {}", tools.len());
+    assert_eq!(tools.len(), 53, "expected 53 tools, got {}", tools.len());
     let chart = tools.iter().find(|t| t["name"] == "books.chart").unwrap();
     assert_eq!(chart["annotations"]["readOnlyHint"], true);
     assert!(
@@ -1120,3 +1120,115 @@ fn mcp_period_statements_over_stdio() {
             .all(|a| a["code"] != "6100")
     );
 }
+
+#[test]
+fn mcp_partnership_from_template_over_stdio() {
+    let init = |mcp: &mut Mcp| {
+        mcp.request(
+            "initialize",
+            json!({
+                "protocolVersion": "2025-06-18",
+                "capabilities": {},
+                "clientInfo": {"name": "smoke-test", "version": "0.1.0"},
+            }),
+        );
+        mcp.notify("notifications/initialized");
+    };
+    // 1. Ask for a template (any server will do).
+    let dir = test_dir("template");
+    let mut scratch = Mcp::spawn(&dir.join("scratch"));
+    init(&mut scratch);
+    let t = scratch.call(
+        "books.chart_template",
+        json!({"entity_type": "multi-member LLC", "owners": ["Ann", "Bo"]}),
+    );
+    let settings = t["settings_toml"].as_str().unwrap();
+    assert!(settings.contains("distribution_account = \"3101\""));
+    let err = scratch.call_err("books.chart_template", json!({"entity_type": "LLC"}));
+    assert!(err.contains("entity_type"), "{err}");
+
+    // 2. Its settings become the company config; its chart, the chart.
+    let toml = dir.join("wanderbooks.toml");
+    std::fs::write(
+        &toml,
+        format!("{settings}\n[books]\nreceipt_threshold = \"10000\"\n"),
+    )
+    .unwrap();
+    let mut mcp = Mcp::spawn_with(
+        &dir.join("books-data"),
+        &[std::ffi::OsStr::new("--books-toml"), toml.as_os_str()],
+    );
+    init(&mut mcp);
+    mcp.call("books.import_chart_csv", json!({"csv_text": t["csv"]}));
+    let post = |mcp: &mut Mcp, date: &str, dr: &str, cr: &str, amount: &str| {
+        let e = mcp.call(
+            "books.draft_entry",
+            json!({"date": date, "description": "x"}),
+        );
+        let id = e["entry_id"].as_u64().unwrap();
+        mcp.call(
+            "books.add_line",
+            json!({"entry_id": id, "account": dr, "side": "debit", "amount": amount}),
+        );
+        mcp.call(
+            "books.add_line",
+            json!({"entry_id": id, "account": cr, "side": "credit", "amount": amount}),
+        );
+        mcp.call(
+            "books.post_entry",
+            json!({"entry_id": id, "confirmed": true}),
+        );
+    };
+    post(&mut mcp, "2026-01-02", "1000", "3000", "1000.00");
+    post(&mut mcp, "2026-01-02", "1000", "3001", "1000.00");
+    post(&mut mcp, "2026-01-10", "1000", "4000", "400.00");
+    post(&mut mcp, "2026-01-20", "3101", "1000", "50.00");
+
+    // 3. Members' equity sees Bo's distribution in his distributions account.
+    let me = mcp.call(
+        "books.export",
+        json!({"format": "json", "report": "members_equity", "start": "2026-01-01", "end": "2026-01-31"}),
+    );
+    let me: serde_json::Value = serde_json::from_str(me["content"].as_str().unwrap()).unwrap();
+    assert_eq!(me["members"][1]["distributions"], "50.00");
+    assert_eq!(me["members"][1]["ending"], "1150.00");
+
+    // 4. Closing January: 200 each to capital, Bo's distributions swept in.
+    let jan = mcp.call(
+        "books.create_period",
+        json!({"name": "2026-01", "start": "2026-01-01", "end": "2026-01-31"}),
+    );
+    let closed = mcp.call(
+        "books.close_period",
+        json!({"period_id": jan["period_id"], "confirmed": true}),
+    );
+    assert_eq!(
+        closed["lines"],
+        json!([
+            "Debit 4000 400.00",
+            "Credit 3000 200.00",
+            "Credit 3001 200.00",
+            "Credit 3101 50.00",
+            "Debit 3001 50.00"
+        ])
+    );
+    let bs = mcp.call("books.balance_sheet", json!({"as_of": "2026-01-31"}));
+    let equity: Vec<(String, String)> = bs["equity_accounts"]
+        .as_array()
+        .unwrap()
+        .iter()
+        .map(|a| {
+            (
+                a["code"].as_str().unwrap().to_string(),
+                a["amount"].as_str().unwrap().to_string(),
+            )
+        })
+        .collect();
+    assert_eq!(
+        equity,
+        [
+            ("3000".into(), "1200.00".into()),
+            ("3001".into(), "1150.00".into())
+        ]
+    );
+}