Fixed assets, fully featured: tags, serials, acquisition links, label sheets, the fixed asset register, and an Assets section in the viewer; fix a flaky verify

- core: asset tags (generated PREFIX-0001 or the human's own; unique ignoring case; never reused by another asset) and serial numbers (rules.md B-24); a journaled link from an asset to the entry that acquired it (posted, unreversed, debiting the cost account); fixed_asset_register(as_of), reconciled to the GL (unposted depreciation, unregistered cost)
- store: asset.tagged, asset.serial_set, asset.acquisition_linked journaled, replayed, projected (schema v9); differs_from now also compares control roles and tag history
- config: [books] asset_tag_prefix, default the company's initials without legal-form words
- import: Avery 5160/8160 label sheets with QR codes (geometry vendored from Avery, docs/spec/sources/avery-5160.md); the register as XLSX and PDF
- mcp: register_asset tags (and links) automatically; books.label_asset, books.asset_labels; asset tools take a tag; books.show asset / assets page / register report; export fixed_asset_register (json, csv, xlsx, pdf) and in the CPA package
- viewer: Assets page (register, reconciliation), asset page (identity, schedule posted vs not, entries, documents), Fixed asset register report, global search by tag/serial/description, journal text, needs-attention items
- fix: verify compared snapshot amounts as strings; a zero total summed in hash-map order could print "0" or "0.00", so agreeing books failed verify at random. Now by value (regression test)
- tests: spec-blind suites for tags, register, prefix, store, MCP; label and register PDF/XLSX tests; viewer tests

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

crates/ledger-import/src/xlsx.rs

@@ -44,25 +44,25 @@ impl From<rust_xlsxwriter::XlsxError> for XlsxError {
 
 /// Accounting number formats: the `_)` reserves a closing parenthesis's
 /// width on positives so decimal points line up with negatives.
-const PLAIN: &str = "#,##0.00_);(#,##0.00)";
-const DOLLARS: &str = "$#,##0.00_);($#,##0.00)";
+pub(crate) const PLAIN: &str = "#,##0.00_);(#,##0.00)";
+pub(crate) const DOLLARS: &str = "$#,##0.00_);($#,##0.00)";
 
-struct Formats {
-    bold: Format,
-    company: Format,
-    centered: Format,
-    header: Format,
-    header_right: Format,
-    plain: Format,
-    dollars_sum: Format,
-    dollars_total: Format,
-    line_label: Format,
-    sub_label: Format,
-    note: Format,
+pub(crate) struct Formats {
+    pub(crate) bold: Format,
+    pub(crate) company: Format,
+    pub(crate) centered: Format,
+    pub(crate) header: Format,
+    pub(crate) header_right: Format,
+    pub(crate) plain: Format,
+    pub(crate) dollars_sum: Format,
+    pub(crate) dollars_total: Format,
+    pub(crate) line_label: Format,
+    pub(crate) sub_label: Format,
+    pub(crate) note: Format,
 }
 
 impl Formats {
-    fn new() -> Self {
+    pub(crate) fn new() -> Self {
         let bold = Format::new().set_bold();
         let ruled = |f: Format| f.set_border_top(FormatBorder::Thin);
         Self {
@@ -97,7 +97,7 @@ impl Formats {
 
 /// Company, title, and period centered over `width` columns; returns the
 /// next free row.
-fn header(
+pub(crate) fn header(
     sheet: &mut Worksheet,
     f: &Formats,
     meta: &ReportMeta,
@@ -120,7 +120,7 @@ fn header(
 }
 
 /// Basis, preparation date, and journal seq under the last row.
-fn footer(
+pub(crate) fn footer(
     sheet: &mut Worksheet,
     f: &Formats,
     meta: &ReportMeta,
@@ -143,7 +143,7 @@ fn footer(
 /// with more than 13 digits before the cents can't show exactly: such an
 /// amount is written as its exact text instead, right-aligned, so the
 /// spreadsheet never shows a wrong number.
-fn number(
+pub(crate) fn number(
     sheet: &mut Worksheet,
     row: u32,
     col: u16,